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Q.

Two steel spheres approach each other head on with the same speed and collide elastically. After the collision one of the sphere's of radius r comes to rest. the radius of the other sphere is

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a

r(3)1/3

b

r3

c

r9

d

(3)1/2 r

answer is A.

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Detailed Solution

m1=(43πr13)e    ⇒ m2=(43πr3)e  V2=0=2m1um1+m2−(m2−m1)u2m1+m2 2m1u1m1+m2=(m2−m1)u2m1+m2 2m1=(m2−m1) 3m1=m2 3r13=r3  r1=r313
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