Physics

Problem

At an instant a ball has instantaneous velocity

v=-15\,\text{m s}^{-1}

while moving along a straight line. Its instantaneous speed at that instant is a)

0\,\text{m s}^{-1}

15\,\text{m s}^{-1}

-15\,\text{m s}^{-1}

7.5\,\text{m s}^{-1}