Question

3.A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground?

Answer 1

Answer:

If the ball drops in uniform acceleration, the ball will drop faster.

Explanation:

Because uniform acceleration is a acceleration that the velocity and speed remains same. So, it will strike the ground faster.

Answer 2

Answer:

S,distance=20 m

a,acceleration =10m/s^2

v,final velocity=?

u,initial velocity=0

We know that

v^2-u^2=2aS

v^2-0=2×10×20

400=v^2

v=20m/s

t=?

We know that 

v=u+at

20=0+10t

t=2 sec