A driver of a car travelling at 54 km/h applies brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 36 km/h in another car applies his brakes slowly and stops in 10 s.
On the same graph paper plot the velocity - time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?
Plot the velocity - time graph ---------------
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Answer: Car B travelled farther than Car A after the brakes were applied.
Explanation:
Car A
u=54km/h = 15m/s
v=0m/s
s= Area under the graph of car A with time axis
s=[1/2] x base x height
=[1/2] x 5 x 15
=37.5m
Car B
u= 36km/h = 10m/s
v=0m/s
s= Area under the graph of car B with time axis
s= [1/2] x base x height
=[1/2] x 10 x 10
=50m
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Answer:
Answer: Car B travelled farther than Car A after the brakes were applied.
Explanation:
Car A
u=54km/h = 15m/s
v=0m/s
s= Area under the graph of car A with time axis
s=[1/2] x base x height
=[1/2] x 5 x 15
=37.5m
Car B
u= 36km/h = 10m/s
v=0m/s
s= Area under the graph of car B with time axis
s= [1/2] x base x height
=[1/2] x 10 x 10
=50m
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