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An iron black of mass m=500 kg is kept a...

An iron black of mass m=500 kg is kept at the back of a truck moving at a speed `v_(0)=90 km h^(-1)` The driver applies the brakes and slows down to a speed of `v=54 km h^(-1)` in 10 s. What constant force acts on the block during this time if the block not slide on the truck-bed :-

A

`-500 N`

B

`300 N`

C

`-400 N`

D

None

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The correct Answer is:
A
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