Question

d. The velocity of a car increase from
54 km/hr to 72 km/hr. How much is
the work done if the mass of the car
is 1500 kg ?

​

Answer 1

Answer:

lets convert it into metr per secon so 54 will be15   and 72 will be 20 meter per second

work =force*distance  travelled

you should give time and distance travelled

Explanation:

Answer 2

Initial Velocity, u=54km/hr=15m/s

Final velocity , v=72km/hr=20m/s

Mass =1500kg

Initial kinetic energy 1/2 mu2

1/2 1500×15×15=168750J

Final kinetic energy 1/2 mv2

1/2 1500×20×20=300000J

So, change in kinetic energy = work done=300000−168750=131250J