ICSE Class 10 Physics 2023 Solved Paper
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A car of mass 120 kg km ∕ h 54 km ∕ h
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Question : 53
Total: 76
the work done by the engine.
Solution:
Given : m = 120 kg
u = 18 km ∕ h = 18 ×
= 5 m ∕ s
v = 54 km ∕ h = 54 ×
= 15 m ∕ s
By work energy theorem,
Work done = Increase in Kinetic Energy
⇒ W =
m v 2 −
m u 2
⇒ W =
m ( v 2 − u 2 )
⇒ W =
× 120 × ( 15 2 − 5 2 )
= 60 × ( 225 − 25 )
= 60 × 200
= 12000 J
By work energy theorem,
Work done = Increase in Kinetic Energy
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