Energy required to accelerate a bus from a speed of 10ms-1 to 20ms-1 compared with that required to accelerate it from 5ms-1 to 15ms-1 is?
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Answer:
Initial speed of the car is u.
Final speed of the car v=0
Let the retardation of the car be a.
Using v
2
−u
2
=2aS
Or 0−u
2
=2aS
⟹ S∝u
2
(for same a)
Given : S=40m u
′
=2u
∴
S
S
′
=
u
2
(u
′
)
2
=2
2
Or
40
S
′
=4
⟹ S
′
=160m
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