A body is thrown vertically upward from the top of the cliff 50m high. Has the body reaches the ground in 10. What is the initial velocity of body?

The second sentence makes no sense.

To calculate the initial velocity of the body, we will use the kinematic equation for vertical motion:

final velocity (vf) = initial velocity (vi) + acceleration (a) * time (t)

In this case, the body is thrown vertically upward, so we assume its final velocity at the highest point is 0 m/s. The acceleration due to gravity is constant and acts downwards, causing the body to decelerate as it moves upward and accelerate as it falls downward.

Therefore, we can rewrite the equation as:

0 m/s = vi - 9.8 m/s² * 10 s

Rewriting this equation, we have:

vi = 9.8 m/s² * 10 s

vi = 98 m/s

Therefore, the initial velocity of the body is 98 m/s.