a) A person moving on a staircase having 100 steps, each steps is of 10 cm. The mass of a
person is 80 kg. Find the work done by the person in reaching at the top. (g-10 m/s?)
(b) Explain weather work done is positive, zero or negative in activities listed below
i) Sushma is swimming in a pound.
ii) Satellite revolving around the earth.
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