a body of mass 4 kg Falls from rest what will be its kinetic energy after 3 seconds is equal to 10 M per second square
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After 3 sec the kinetic energy of the body will be 1800 Joules
Explanation :
Kinetic energy of a body is given by,
KE = mv²/2
Given data,
initial velocity = u = 0
acceleration, a = g = 10 m/s²
time = t = 3 sec
from the laws of motion,
v = u + at
=> v = 0 + 10 x 3 = 30 m/s
mass = 4 kg
Hence kinetic energy,
KE = mv²/2
= 4 x 30 x 30/2
= 1800 Joules
Hence after 3 sec the kinetic energy of the body will be 1800 Joules
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