Question

a car accelerates uniformly from rest to the speed of 20 metre per second in 8 seconds. the mass of car is 1200 kg. calculate the acceleration of car and minimum force to produce this acceleration?

Answer 1

given:
u=0
v=20m/s
t=8s
therefore
a=v-u/t
=20-0/8
=20/8
=5/2 m/so

m=1200 kg
therefore
f=ma
=1200*5/2
=600*5
=3000N

Answer 2

v = u+at

20 = a[8]

a= 2.5 ms⁻²

F = ma = 1200 x 2.5 = 3000 N