Question

In the second experiment, the angle of incline is changed and the ball is again released from rest (the acceleration is again constant). In this second experiment, if the speed of the ball is 5 m/s after 2 seconds, what is its speed after 3 seconds?

Answer 1

Answer:

$v_{f}=7.5m/s$

Explanation:

Initial velocity is 0, why the ball is released from the rest

at t=2s:

$v_{f}=at$

$a=\frac{v_{f}}{t}=5/2=2.5m/s^2$

at t=3s:

$v_{f}=at=2.5*3=7.5m/s$