1both wrong
a ball is dropped wid negligible velcity
on a floors of a lift
which is accelerating upwards
the e=1 when the ball strikes the floor
8:40 PM
assertion the ball will reach to the same heigh[in earths frame..]
reason:when a negligible mass collides to a big mass....then the magnitude of velocity remains same........
choice:
A. both r right n reason is corect explanation for assertion
B.both r right but reason isnt corect explanation for assertion
C.a is right R is wrng
d.R is right but A is wrong
E.both are wrong....
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8 Answers
1clearly v1=(m1-m2)/(m1+m2)u1 + 2m2/(m1+m2)u2
now if and only if u2=0 and m2>>m1,
v1= - u1 but here u2≠0, so here v1=2*velocity of lift-u1.
thus, both wrong...
1uum..but a infinite mass havin v can b considered to b at rest????so the ball should bounce back to same height rit???
62Read Ith power's solution.. u will realise the mistake..
he has proved that it will nto bounce back with same veloity!