Question

a car is moving with a velocity of 20m/s after application of brake car comes to rest in 4 sec the displacement covered by car during this time is

80m

60m

40m

20m​

Answer 1

Answer:

Correct option is

B

10ms

−1

Retardation =2ms

−2

Time =5s

So, decrease in velocity = retardation × time =(2×5)ms

−1

=10ms

−1

Initial velocity =20ms

−1

So, final velocity = (initial velocity) − (decrease in velocity) =(20−10)ms

−1

=10ms

−1

Answer 2

Answer:

Answer is 40m

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