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Q.

It was once recorded that a car left skid marks which were 300 m in length. Assuming that the car skidded to a stop with a constant acceleration of-4ms-2 , the speed of the car before it began to skid is     

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a

405ms-1

b

406ms-1

c

305ms-1

d

206ms-1

answer is C.

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Detailed Solution

Displacement s = 300m, Final velocity v = 0, Acceleration a=-4ms-2,

We know v2-u2=2as 02-u2=2(-4)300 u=2400=206m/s u=206m/s-1

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