A constant force of 100 N acts on the body for 8 s for changing its momentum. The change of momentum of the body is ______ newton second.

Options

A. 400
B. 800
C. 200
D. 100

Answer

B

Explanation

By Newton's `2^(nd)` law
`F=(m(v-u))/(t)`
`implies mv - m u= F xx t`
Substituting F = 100 N
t = 8 s
`mv - m u = 100 xx 8 = 800 Ns`