Question

velocity of car increase from 54km to 52km/hr. How much work done is the mass of car is 1500 kg?

Answer 1

Hello

Mass of car m = 1500 kg
Initial velocity = 54 km/h
= 54 x 5/18 = 15 m/s
Final velocity = 72 km/h
= 72 x 5/18 = 20 m/s.
(1 km/h = 1000 m/ (3600 s) =5/18 m/s.

Initial kinetic energy = ½ mv2
= ½ x 1500 x (15)2
= 168750 J
Increased kinetic energy = 1/2 mv2
= ½ x 1500 x (20)2
= 300000 J
Work done = Change in kinetic energy
= 300000 - 168750
= 131250 J
Hence the work done by the force on the car = 131250J


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