A mass of 50 kg is then dropped from 20m . What is its speed as it hits the ground?

Statement:

A mass of 50 kg is dropped from 20m.

To find out:

The speed of the ball as it hits the ground.

Solution:

Mass (m) = 50 KgHeight (h) = 20 mInitial velocity (u) = 0 m/s [The ball was at rest]Acceleration due to gravity (g) = 10 m/s^2Let the speed of the ball as it hits the ground be v.We know the equation of motion for a freely falling body, v^2 = u^2 + 2ghPutting the values in the above equation, we getv^2 = (0)^2 + 2(10)(20)or, v^2 = 400or, v = √400or, v = 20 m/s

Answer:

The speed of the ball as it hits the ground is 20 m/s.

Hope you could understand.

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