Question

If the linear momentum is increased by 5%, the kinetic energy will increase by(a) 50% (b) 100%(c) 125% (d) 10%

Answer 1

KE=1/2 mv²

Since p=mv,

KE=1/2 pv

If v=5 ; m=20,

Then,KE=1/2×5×20

Hence,KE=50.5

m+5% = 50 + 5%

=52.5

Therefore,

KE=1/2 (52.5)(5)

=625/4=156.25