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A rubber ball is released from a height of 5 m above the floor. It bounces back repeatedly, always rising to $\frac{81}{100}$ of the height through which it falls. Find the average speed of the ball. (Take $g = 10$ ms$^{-2}$)
(1) 3.0 ms$^{-1}$
(2) 3.50 ms$^{-1}$
(3) 2.0 ms$^{-1}$
(4) 2.50 ms$^{-1}$
BETA
