Question

The average resisting force that must act on `5kg` mass to reduce its speed from 65 to `15ms^-1` in `2s` is
A. (a) `12.5N`
B. (b) `125N`
C. (c) `1250N`
D. (d) None of these

Answer 1

Correct Answer - B
`Impu lse=F_(av)(Deltat)=|DeltaP|`
`:. F_(av)=(|DeltaP|)/(Deltat)=(m(v_i-v_f))/(Deltat)`
`=((5)(65-15))/(2)`
`=125N`