Q1) An experiment to measure the quality of metal balls (mass 2 kg) is as follows:
 they fall out rest, then bump into an oblique surface (refund coefficient e = 0.8) and
 end up a little later the ground. 
The distances d1 and d2 are 90 cm respectively and 60 cm. The angle θ = 40 °.

Requested: 
(a) The magnitude of velocity just after impact at B. 
(b) The distance s 
(c) The magnitude of the speed just before it hits the ground A touches

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