Question: a ) A 3 0 N force is used to pull a block along a friction - free surface for 1 0 m . How

a) A 30N force is used to pull a block along a friction-free surface for 10m. How much work has been done?
b) A travel kettle has a power of 1kW. It boils a cup of water in 80 seconds. How much energy is transferred?
c) A person whose mass is 80kg runs up two flights of stairs, totalling 20m high, in 10 seconds. What is the average power of the person?

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