A car travelling at 20 m/s takes a U-turn in 20 second without changing its speed. What is the average acceleration of the car ? (1) 1 m/s2 (2) 4 m/s2 (3) –1 m/s2 (4) –2 m/s2
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Answer:
Velocity is vector quantity so direction matters.
v
i
=25m/s,v
f
=−25m/s.
Δv=(−25)−25=−50m/s
Average acceleration =
Δt
Δv
=
5
50
=10ms
−2
.
Explanation:
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