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Q. A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.60 m/s2 over the distance of 20.80 cm. It then decelerates at the constant rate of 1.03m/s2 (because of friction), until it again comes to rest. Find out the total time the block is in motion.

Q. A flat circular mirror of radius 0.110 m is lying on the floor. Centered above the mirror, at a height of 0.740 m, is a light source. Calculate the diameter of the bright circular spot formed on the 2.80 m high ceiling by the light reflected from the mirror.

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