## A lift with its occupants has a mass of 5000 kg . Calculate the tension in the elevator cable if it is: a) accelerated upward by 1.5 m/s 2 ; b) decelerated upward by 1.5 m/s2; c) accelerated downward by 1.5 m/s 2 ; d) decelerated downward by 1.5 m/s 2 . The spring of a cork gun has a spring constant of 20 N/m . A cork is shot horizontally from 10 m above the ground using this gun. How far the cork will travel before it hits the ground; ignore the air resistance in the calculation.

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