2(iv)
(a) What should be the angle between the direction of force and the direction of displacement, for work to be negative?
(b) Name the physical quantity obtained using the formula $\frac{\text{U}}{\text{h}}$, where U is the potential energy and h is the height.
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(a) 180°
(b) As gravitational potential energy [U] = mgh
Hence, $\frac{U}{h}$ = mg
Therefore, the physical quantity obtained is weight of the object.