Q1. A force of 10N displaces a body by a distance of 2m at an angke of 60⁰ to its own direction. Find the amount of work done.
Q2. A crane pulls up a car of 500kg to a vertical height of 4m. Calculate the work done by the crane.
Q3. A man exerts a force of 200N in pulling a cart at a constant speed of 16ms^-1. Calculate the power spent by the man.
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Explanation:
1. W = fs cos theta
= 10 x 2 x cos 60⁰
= 20 x ½
= 10J
2. w = m xg xh
= 500 x 9.8 x 4 J
3. P = f x v
= 200 x 16 W
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