Question

An object of mass 100 kg is accelerated uniformly from a velocity
of 5 m s' to 8 m s in 6 s. Calculate the initial and final
momentum of the object. Also, find the magnitude of the force
exerted on the object.

​

Answer 1

Momentum=mass*velocity

Initial momentum=100*5

=500kg m/s

Final Momentum=100*8

=800 kg m/s

Change in Momentum =300kg m/s

Force = Change in momentum/Change in time

=300/6

=50N

Answer 2

change in momentum is nothing but,
= m(v-u) ÷ t
= 100(8-5)÷6
= 300÷6
= 50 kgm/s
force is nothing but the rate of change in momentum, by newton second law,
= 50N