Question

(b) An object of mass 50 kg is accelerated uniformly from a velocity of 4 m/s to 8 m/s in 8 s. Calculate the initial and final momentum of the object. Also find the magnitude of the force exerted on the object.​

Answer 1

Explanation:

P=mv

∆P=m(v-u)

∆p=50(8-4)=50×4=200

F=ma

a=v-u/t

a=4/8=0.5

F=50×5/10=25N

Answer 2

Explanation:

Given,

m=50 kg

u=4 m/s

v=8 m/s

t=8 sec

mu=?

mv=?

F=?

Now,

mu=50*4

=200 kgm/s

and,

mv=50*8

=400 kgm/s

and,

F=ma

=m×(v-u/t)

=50×(8-4/8)

=50×4/8

=25N