Question

Calculate the work required to be done stop a car of 1200 kg moving with a vilocity of 54km hour

Answer 1

Given,
mass of the object = 1200 kg
velocity= 54km/hr=15m/s

work done here is in the form of kinetic energy.

so, work done = 1/2mv^2
=1/2 x 1200 x( 15m/s)^2
=600 x  225 m/s^2
= 135000Joules.

hope it helps u.......

Answer 2

Mass of car = 1200 kg

Velocity = 54km/h
               = 15m/s
Work done = K.E. of the car
 
              = 1/2 x mv²
             = 1/2 x 1200 x (15ms^-1)²
             = 1/2 x 1200 x 225 m²s-²
             = 135000 joules.