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An iron block of mass m = 500 kg is kept...

An iron block of mass m = 500 kg is kept at the back of a truck moving at a speed `v_(0)=90km h^(-1)`. The driver applies the brakes and shows down to a speed of `v=54km h^(-1)` in 10s. What constant force acts on the block during this time if the block does 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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