Question

what is the work to be done to increase the velocity of a car from 30 km h to 60 km h if the mass of the car is 1500 kg ?

Answer 1

This is ur ans hope it will help you in case of any doubt comment below

Answer 2

Work done is equal yo change in kinetic energy....(Work Energy Theorem).

W = 1/2 * m * (v^2-u^2)

Here m = 1500kg , u = 30km/h
= 30*1000/60*60 m/s
= 25/3 m/s and v = 60km/h
= 60* 1000/60*60 m/s
= 50/3 m/s.

=) W = 1/2 * 1500 kg * [(50/3)^2-(25/3)^2]

=) W = 750 * (2500/9 - 625/9)

=) W = 750* 208.333 J

=) W = 156250 J.

Hope it's helpful to u.