A body of mass 10kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 sec is

Options

A. 100 J
B. 300 J
C. 50 J
D. 125 J

Answer

D

Explanation

`vecF_("net") = sqrt(3^2+4^2) = 5N`
`a=F/m =5/10 =1/2 m//s^2`
K.E `=1/2 mv^2 =1/2 m(at)^2 =1/2 xx10 xx25 = 125 J`