Question

A body is moving along y-axis and force acting on it is given by f = sin ky, where k is a constant. The work done by the force from y = 0 to y = 1 is choose answer:

Answer 1

W = f*d = sin ky *y = -1/k* cos ky
Now putting limits
W = - 1/k (cos k - 1)= (1-cos k) /k