Question

The speed of ce vehical of mass 500 kg increases from 36km/h to 72 km/h. calculate its increase in Kinetic energy. ​

Answer 1

Answer:

75000J

Explanation:

KE = k2-k1

=1/2m(v2-u2)

=250(400-100)

=75000 J

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Answer 2

Answer:

helpful?

Explanation:

Initial speed u=36 km/h=10 m/s

Final speed v=72 km/h=20 m/s

Now change in KE=

2

mv

2

−

2

mu

2

change in KE=

2

500×20

2

−

2

500×10

2

ΔKE=7.5×10

4

J