find out the change in velocity of object between 20s and 40s
a.90 m/s
b.4.5m/6. C.9 m/s d.150
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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
Explanation:
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