A metal ball falls from a height of 1m on to a steel plate and jumps upto a height of 81cm . The coefficient of restitution of the ball and steel plate is

Question

A metal ball falls from a height of 1m on to a steel plate and jumps upto a height of 81cm . The coefficient of restitution of the ball and steel plate is (A) 0.2 (B) 9 (C) 0.9 (D) 90

Tardigrade Admin · Accepted Answer

e=(V e l o c i t y o f s e p r a t i o n /V e l o c i t y o f a p p r o a c h ) e=√(h2/h1) = √(81/100) = 0.9

Q. A metal ball falls from a height of $1 m$ on to a steel plate and jumps upto a height of $81 c m$ . The coefficient of restitution of the ball and steel plate is

$0.2$

$9$

$0.9$

$90$

$e = \frac{V e l oc i t y o f se p r a t i o n}{V e l oc i t y o f a pp ro a c h}$
$e = \frac{h _{2}}{h _{1}}$ $= \frac{81}{100} = 0.9$

Q. A metal ball falls from a height of 1m on to a steel plate and jumps upto a height of 81cm . The coefficient of restitution of the ball and steel plate is

0.2

9

0.9

90

e=VelocityofapproachVelocityofsepration​ e=h1​h2​​​ =10081​​=0.9

Q. A metal ball falls from a height of $1 m$ on to a steel plate and jumps upto a height of $81 c m$ . The coefficient of restitution of the ball and steel plate is

$0.2$

$9$

$0.9$

$90$

$e = \frac{V e l oc i t y o f se p r a t i o n}{V e l oc i t y o f a pp ro a c h}$
$e = \frac{h _{2}}{h _{1}}$ $= \frac{81}{100} = 0.9$