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An object of mass 10kg moves at a consta...

An object of mass 10kg moves at a constant speed of 10 `ms^(-1)`. A constant force, that acts for 4 sec on the object, gives it a speed of `2ms^(-1)` in opposite direction. The force acting on the object is `:`

A

`-3N`

B

`- 30 N`

C

3N

D

30N

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