1
WB JEE 2017
MCQ (More than One Correct Answer)
+2
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A small steel ball bounces on a steel plate held horizontally. On each bounce the speed of the ball arriving at the plate is reduced by a factor e (coefficient of restitution) in the rebound, so that Vupward = eVdownward. If the ball is initially dropped from a height of 0.4 m above the plate and if 10 seconds later the bouncing ceases, the value of e is
A
$$\sqrt {{2 \over 7}} $$
B
$${{3 \over 4}}$$
C
$${{{13} \over {18}}}$$
D
$${{{17} \over {18}}}$$
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