Question

Please help mee

1. A body weighing 2 kg moves in a straight line with a speed of 72 km / h. If the force 10N will act on the body, after how long will its speed become 30m / s? ​

Answer 1

It's an uniformly accelerated motion

Vf=at +v0

v0=72 km/h:3.6=20 m/s

a=F/m=10/2=5m/s^2

t=(vf-v0)/a

t= (30-20)/5=10/5=2s