Question

4. A driver of a car travelling at 50 km/h applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5s. Another drives going at 4 km/h in another car applies his brakes slowly and stop in 10s. Plot the speed versus time graph for the two cars. Which of the two cars travelled farther after the brakes were applied?​

Answer 1

Answer:

u=50km/h

t=5s

--------------------

u=4km/h

t=10s

Explanation:

the second car travelled further after applying brakes

the graph would be a straight line first going up then going down

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Answer 2

Answer

First, let us convert both speeds in m/s

Conversion from km/h to m/s

1 km = 1000 m 1 hour 60 minutes = 3600 s 1 km 1000 m

3600

1 km/h- m/s

Car 1

Initial velocity 52 km/h

5 = 52 x= m/s 18

130 18 m/s

= 14.44 m/s

Final Velocity=0 m/s Time = 5 second

Car 2

Initial velocity = 3 km/h

= 3x - m/s

18

18

5 = m/s

= 0.833 m/s

Final Velocity=0 m/s

Car 2

Distance Travelled

= Area under v-t graph

27

Car 1

Distance Travelled

Area under v-t graph

130

EX

x10x

=4.166 m

= 36.11 m

So, Car 1 Travelled farther when breaks were applied