Question

A force is applied on a car of mass 1500 kg so that its speed increases from 54 km per hour to 72 km per hour. Find the work done by the forcr on the car. If the acceleration produced in the cars is 5m/s

Answer 1

Given

u=54km/h =15m/s

v=72km/h =20m/s

a=5m/s

From newton's third law

v^2-u^2=2as

(20)^2-(15)^2/2×5=s

400-225/10=s

175/10=s

17.5=s

Now

W=F×s

W=ma×s (F=ma)

W=1500×5×17.5

W=131250.

HOPE IT'LL HELP U.