Question

Find the momentum of an object of mass 100g having a kinetic energy of 20J.

Answer 1

let, velocity of the object = v m/s

given mass,(m)=100g =0.1kg

∴1/2mv²=20

⇒1/2*0.1*v²=20

⇒0.05*v²=20

⇒v²=20/0.05

⇒v²=400

⇒v=20

∴momentum=m*v=0.1*20 kg m/s

=2 kg m/s