A rigid body of mass 5 kg initially at rest is moved by a horizontal force of 20 N on a frictionless table. Calculate the work done by the force on the body in 10 second and prove that this equals the change in kinetic energy of the body.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(4000 J)
Sol. Work done by the force = 
= F × 
at 2
= F × 
× 
× t 2
= 
= 
= 4000 J
Now 
K 
= m (v 2 – u 2 )
= 
m (2as) = m × 
× 
× 
× t 2
= 
= 4000 J
W F = 
K.
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