Question

An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms^–1 to 8 ms^–1 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

Answer:

Mass= 100kg

Vi=5m/s

Vf=8m/s

t=6s

Pi=m×vi

Pf=m×vf

Pi=100×5=500kgm/s

Pf=100×8=800kgm/s

Force=(pf-pi)/t

=(800-500)/6

=300/6

=50N

Answer 2

Answer:

initial momentum 100 × 5 =500 kg.m./sec.

final momentum 100 × 8=800 kg.m./sec.

force = mass ×acceleration

acceleration = 8-5/6= 1/2 m./sec^2

force = 100×1/2 = 50 newton