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:

Work done = 1,31,250 J

Explanation:

We know,

work, w = 1/2 * m* (v1 ^2 -v2^2)

Here, m= 1500 kg

v1 = 54 km = 54 * 1000 / 3600 m/s = 15 m/s

v2 = 72 km = 72 * 1000 / 3600 m/s = 20 m/s

So, w= 1/2 * 1500 * (20^2–15^2) = 1,31,250 J

Work done = 1,31,250 J

Answer 2

Answer:

Explanation: Given

Mass m = 1500kg

U = 54 km/ hr

= 54 X 5 / 18

= 15 m/s //

V = 72 km /hr

= 72 X 5 / 18

= 20 m/s //

By applying the formula

K.E = 1/2 m ( v²- u²)

1/2 X 1500 ( 20²- 15²)

By solving you will get the answer as

13125 J //