Consider the following statements A and B and identify the correct answer given below. (A) A body initially at rest is acted upon by a constant force. The rate of change of its kinetic energy varies linearly with time. (B) When a body is at rest, it must be in equilibrium

Options

A. A and B are correct
B. A and B are wrong
C. A is correct and B is wrong
D. A is wrong and B is correct

Answer

c

Explanation

`K.E=1/2mv^(2)=1/2ma^(2)t^(2)[overset(u=0,form) underset(v=u+at)]`
Rate of cahnge of energy, deltaE=dE/dt
`=d/dt[1/2ma^(2)t^(2)]=ma^(2).t`
dE/dt alphat