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# A Body of 2 Kg Falls from Rest. What Will Be Its Kinetic Energy During the Fall at the End of 2 S? (Assume G = 10 M/S2) - Science

Short Note
Sum

A body of 2 kg falls from rest. What will be its kinetic energy during the fall at the end of 2 s? (Assume g = 10 m/s2)

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#### Solution

Mass of the body, (m) = 2 kg
Initial velocity of the ball, (u) = 0 m/s
Time, (t) = 2s
Acceleration due to gravity, (g)  = 10 m/s2
Let the final velocity of the ball after 2 s be (v)
We know v = u + at
So, v = 0 + 10 (2) = 20 m/s
Now we can find the kinetic energy as:
Therefore,
K.E = 1/2 (2)(20)^2 "J"
= 400 J

So, the kinetic energy of the moving object is 400 J.

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#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 4 Work and energy
Short Answers | Q 33 | Page 146
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