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Physics 8 Online
OpenStudy (anonymous):

A ball of mass 0.4 kg is dropped from the top of a cliff of height 35m, As it falls, the ball is subject to a constant force of air resistance of magnitude 1.5 N. I worked out the resultant force which is 2.42 N. The acceleration is 6.05 ms^-2. Find the time it takes the ball to reach the foot of the cliff.

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