Question

A vehical is accelerated from 36km/hr to 90 km/hr in 2 seconds.
Calculate the force applied to it if the mass of the vehicle is 100kg

Answer 1

u = 36 km per hour = 10 m per second

v = 0 as driver apply brakes

t = 5 seconds

a = v - u divided by t

so a = -2 m per second (-due to retardation)

s =ut + half a(t)^2

s = 50 + (-25)

s = 25 metres