Question

calculate the force required to impart to a car 80 m/s in 15 seconds starting from rest the mass of the car is 2400 kg​

Answer 1

Answer:12720N

Explanation:v=80m/s, u=0

acceleration=v-u/t

a=80-0/15= 5.3m/s^2

F=ma

F=2400×5.3

F=12720

Answer 2

Explanation:

We know that,

change in momentum = force × time

∆p = F∆t

Since car is initially at rest its initial momentum is zero

Final momentum = mass×velocity

= 2400 kg × 80 m/s

= 192000 kgm/s

Time = 15 s

Therefore, Force is given by

=192000 = F(15)

=F = 192000/15

=F = 12800 N