Question

a body of mass m1 moving with velocity uniformly of 40 m/sec collides with another body of mass m2 at rest and then the two bodies together begin to move with velocity uniformly 30 m/sec .the ratio of their masses m1/m2 is ? a.0.25 b. 1.33. c.3. d.4​

Answer 1

INITIAL MOMENTUM OF SYSTEM,

=m1*40+m2*0

=40m1

FINAL MOMENTUM OF SYSTEM

=(m1+m2)*30

BY THE LAW OF CONSERVATION OF MOMENTUM

INITIAL momentum=FINAL momentum

40m1=(m1+m2)*30

40m1-30m1=30m2

10m1=30m2

m1=3m2

m1/m2=3

[ 3 is your answer]

hope this helps you