Question

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

☣ mass m = 1500 kg

U = 54 km / hr

54 X 5 / 18

= 15 m/s //

☣ v = 72 km/ hr

= 72 X 5 / 18

= 20 m/s //

We know that work done = change in kinetic energy

KE = 1/2 m ( v² - u²)

1/2 X 1500 ( 20² - 15² )

= 1/2 X 1500 ( 400 - 225 )

= 750 X 175

= 13125 J //

Answer 2

Answer:

Explanation: m= 1500 kg , v = 72 km/hr = 20 m/s

U = 54 km/hr = 15 m/s

K.E. = 1/2 m ( v² - u²)

1/2 X 1500 ( 20² - 15²)

= 13125 j