Question

(xiv)The rate of doing work is zero when the angle between force and
velocity is:(a)0° (b)45° (c)180 °(d)90°​

Answer 1

Answer:

d. 90°

Explanation:

because cos of 90 is zero

and work is force ×displacement ×cos A

Answer 2

Answer:

d) 90 degree

Explanation:

work = displacement / force