Question

A motor car of mass 25kg is moving with a certain velocity. It is brought to rest by the application of brakes, within a distance of 20m when average resistance being offered to it is 500n .What is the velocity of motor car?

Answer 1

Given,
Mass of the motor car=25kg
Final velocity(v) =0
Initial velocity =?
Acceleration =F/m= - 500/25=20 m/s^2
We have v^2-u^2=2as

u^2=v^2-2as
u^2=0-2(20).20
u^2=0-800
u^2=-800
u= root of ( - 800)
Hope it helped u!

Answer 2

Answer:

Refer to the attachment, hope it helps..