A body of mass 5 kg is acted on by a net force F which varies with time t as shown in the given figure. Then the net momentum in S.I. units gained by the body at the end of 10 seconds is

Options

A. `0 kgms^(-1)`
B. `100 kg ms^(-1)`
C. `140 kg ms^(-1)`
D. `200 kg ms^(-1)`

Answer

C

Explanation

Change in momentum = Area under F-t graph
= Area of trapezium OABC
`=1/2 (10 +4 ) xx 20 = 140 kg ms^(-1)`