If the force is always perpendicular to motion, then KE remains constant

Options

A. KE remains constant
B. Work done is zero
C. velocity is constant
D. speed is constant

Answer

A, B, D

Explanation

Here, `theta=90^(@), W=Fs cos theta=Fs cos 90^(@)=0`
So work done is zero.
In uniform circulart motion, speed is always a constant but velocity changes as direction changes.
If speed is constant, then `KE` is also constant.