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 `:`

Options

A. `3 m//s^(2)`
B. `-3m//s^(2)`
C. `0.3 m//s^(2)`
D. `-0.3 m//s^(2)`

Answer

B

Explanation

`a=(-2-10)/(4)=(-12)/(4)=-3m//s^(2)`