Question

An object is falling freely from 'X' height, then the time taken by the object to reach ground is 10s. What is the height ®X®?
(g =10m/s

Answer 1

Answer:

4 seconds

Explanation:

Given :

Height from where the object is released = s = 80 metres

Gravitational force = a = 10 m/s²

Initial velocity = u = 0 m/s

To find:

Time taken by the object to reach the ground

Using the second equation of motion :

S=ut+½×at²

80=0×t+½×10×t²

80=5t²

16=t²

t = 4 seconds

The time taken for the object to reach the ground is equal to 4 seconds

Explanation:

here gg

Answer 2

Answer:

Since the ball is in free-fall, the only force acting on it is gravity. Therefore, we can use the principle of conservation of mechanical energy - initially the ball has potential energy and no kinetic energy.

After it has fallen a height

2

x

it will possess half potential and half kinetic energy.

Hence, option C is correct.