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ALL CIE PHYSICS DOUBTS HERE !!!

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ashwinkandel:
Sir(astarmathsandphysics), I think you forgot the answer to fourth question.

astarmathsandphysics:
You are right sorry.

astarmathsandphysics:
a)natural resonance frequency of system shown be nowhere near frequency of earthquake waves.
b)gradient is negative and constant so a=-kx
c)k=omega^2=10/0.02=500 so omega=sqrt(500)=22.4
f=omega/2pi=22.4/6.28=3.6 Hz

silvercameron:
can someone pls explain why the answer to Q.no. 11 is A? See attachment.

astarmathsandphysics:
Use Newtons Law of restitution
e=(separation speed)/(approach speed)=(v2-v1)/(u1+u2)
e=1 for a perfectly elastic collision so v2-v1=u1+u2
answer is D

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