JEE Mains Model Paper 4

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Question : 34 of 90

Marks: +1, -0

M_1

M_2

having equal mass are free to move on a horizontal frictionless surface.

M_2

is attached to a mass less spring as shown in figure. Initially

M_2

M_1

, is moving toward

M_2

with speed v and collides head-on with

M_2

a) while spring is fully compressed all the KE of

M_1

is stored as PE of spring

b) while spring is fully compressed the system momentum is not conserved, though final momentum is equal to initial momentum

c) if spring is massless, the final state of the

M_1

, is state of rest.

d) if the surface on which blocks are moving has friction, then collision cannot be elastic.

a,b, are correct
c,d are correct
a,b,c,d are correct
b,c,d are correct

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