Question

an object is falling freely from a height of 20 m calculate its velocity just before it hits the ground and the time it takes to reach the ground G equals to 10 m/s. for class 9

Answer 1

S = Distance travelled by the object during free fall

= Height from which it falls

= 20 m

a = Acceleration of the object

= Accleration due to gravity

= g

= 10 m/s²

Initially, the body was at rest.

Therefore, initial velocity, u = 0 m/s

Therefore, using the third equation of motion,

v² - u² = 2aS, we get

v² - 0² = 2 × 10 × 20

=> v² = 400

=> v = √400

=> v = 20 m/s

Therefore, velocity of the object just before it hits the ground is 20 m/s.

Answer 2

Answer:

The the stone will hit the ground with a velocity of 20 m/s in sec.

Explanation:

i hope this helps u