Question

velocity of car increased from 54 km per hour to 72 km per hour how much is the work done if the mass of the car is 1500 kg pls tell fast today is my test

Answer 1

work = force×displacement
but F=ma
$a = \frac{v - u}{t}$
72-54/t
18/t

work =1500×18/t×displacement

you can put time and displacement in it and get answer . they are not mentioned in question

Answer 2

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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