Question

Why a ball falling from height comes up when it touches ground ?

PLEASE ANSWER

Answer 1

Explanation:

1

A ball is dropped from a height of 20 m. What is its velocity when it touches the ground (take g=10m/s)? How long did it take to reach the ground?

Experience pure racing performance with the new TVS Apache RTR.

Anupam Pal

Answered June 22, 2018

we know,

s=h=20

a=g=±10m/s=10m/s (since it is dropped)

v^2-u^2= 2as

v^2=2x10x20 (u=0; it is dropped not thrown)

v=20m/s

for calculating time

we know,

v=u+at

20= 0+ 10xt

t=2seconds

thus, it will attain a speed of 20m/s before touching the ground, but the time taken to reach the ground is 2seconds. Because the velocity is not uniform but acceleration/gravity is. If still there is any confusion. Try the same problem with 80 of height.

Answer 2

Answer: It's potential energy gets converted into Kinetic energy

Explanation: It's potential energy gets converted into Kinetic energy