Question:
A person from a truck, moving with a constant speed of $60$ km/h, throws a ball upwards with a speed of $60$ km/h. Neglecting the effect of rotation of Earth, choose the correct answer from the given choices
A person from a truck, moving with a constant speed of $60$ km/h, throws a ball upwards with a speed of $60$ km/h. Neglecting the effect of rotation of Earth, choose the correct answer from the given choices
Show Hint
In absence of horizontal forces, projectile retains its horizontal velocity, making it return to the thrower in moving frames.
Updated On: May 1, 2026
- The person cannot catch the ball when it comes down since the truck is moving
- The person can catch the ball when it comes down, if the truck is stopped immediately after throwing the ball
- The person can catch the ball when it comes down, if the truck moves with speed less than $60$ km/h but does not stop
- The person can catch the ball when it comes down, if the truck moves with speed more than $60$ km/h
- The person can catch the ball when it comes down, if the truck continues to move with a constant speed of $60$ km/h
Show Solution
Verified By Collegedunia
The Correct Option is
Solution and Explanation
Concept:
In projectile motion, horizontal velocity remains constant if no external horizontal force acts.
Step 1: Initial horizontal velocity of ball.
Ball has horizontal velocity equal to truck: \[ v_x = 60 \text{ km/h} \]
Step 2: Motion during flight.
No horizontal force acts, so horizontal velocity remains unchanged.
Step 3: Relative motion with truck.
If truck continues at same velocity, both ball and person have same horizontal motion. \[ \Rightarrow \text{Ball returns to the same position relative to the person} \]
Was this answer helpful?
0
0
Top KEAM Physics Questions
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- Two capillary tubes A and B of diameter $1\, mm$ and $2\, mm$ respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is
- In the circuit given in figure, 1 and 2 are ammeters. Just after key K is pressed to complete the circuit, the reading will be
- A plate has a length $ 5\pm 0.1\text{ }cm $ and breadth $ 2\pm 0.01\text{ }cm $ . Then the area of the plate is:
View More Questions
Top KEAM Relative Velocity Questions
- The velocity of a swimmer in the direction of flow of river is \(10 \, \text{kmh}^{-1}\) and that against the flow of river is \(6 \, \text{kmh}^{-1}\). The velocity of the swimmer in still water in \(\text{kmh}^{-1}\) is
- A train of length $L$ moves with a constant speed $V_t$. A person at the back of the train fires a bullet at time $t=0$ towards a target which is at a distance of $D$ (at time $t=0$) from the front of the train (on the same direction of motion). Another person at the front of the train fires another bullet at time $t=T$ towards the same target. Both bullets reach the target at the same time. Assuming the speed of the bullets, $V_b$, are same, the length of the train is
- A boat is moving from the east bank to the west bank on a south flowing river. If the speed of the boat is 4 km/h and that of the river is 3 km/h. If the width of the river is 2 km, the distance travelled by the boat is
- A man rides a bicycle with a speed of \( 17.32 \text{ m s}^{-1} \) in east-west direction. If the rain falls vertically with a speed of \( 10 \text{ m s}^{-1} \), the direction in which he must hold his umbrella is
Top KEAM Questions
- i.$\quad$ They help in respiration ii.$\quad$ They help in cell wall formation iii.$\quad$ They help in DNA replication iv. $\quad$They increase surface area of plasma membrane Which of the following prokaryotic structures has all the above roles?
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- If $\int e^{2x}f' \left(x\right)dx =g \left(x\right)$, then $ \int\left(e^{2x}f\left(x\right) + e^{2x} f' \left(x\right)\right)dx =$
View More Questions