Question

A ball is gently dropped from a height of 20m if its velocity is zero increased uniformly @ 10 metre per second square with what velocity will it strike the ground also calculate the time at which it is strike

Answer 1

Given , a=10m/s^2

h or S=20m

By using the formula ,

1)Acceleration=change in velocity/time

since, velocity=distance/time

So,a=distance/time^2

10=20/t^2 t^2= 2s^2.

t=1.4s

2) velocity with which ball strikes the ground=d/t

=20/1.4

=14.3 m/s.