An
object of mass 100 kg is accelerated uniformly from a velocity of 5 m
s ^{ −1 }
to 8 m

s ^{ −1 }
in 6 s. Calculate the initial and final momentum of the object. Also,
find the magnitude of the force exerted on the object.

Initial
velocity of the object, *u*
= 5 m/s

Final
velocity of the object, *v*
= 8 m/s

Mass
of the object, *m*
= 100 kg

Time
take by the object to accelerate, *t*
= 6 s

Initial
momentum = *mu*
= 100 × 5 = 500 kg m s^{−1}

Final
momentum = *mv*
= 100 × 8 = 800 kg m s^{−1}

Force
exerted on the object, *F*
=

Initial
momentum of the object is 500 kg m s^{−1}.

Final
momentum of the object is 800 kg m s^{−1}.

Force exerted on the object is 50 N.

**
**