1.0 A girl stands inside a lift on the second floor of an 18 storey building. If the lift is
ascending upwards at an acceleration of 3ms-2
and she weighs 60kg, determine the reaction of
the lift at the girl's feet. (3mks)
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Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up