A 20 kg ball collides head-on with a 40kg ball, which is initially stationary. T
ID: 1336629 • Letter: A
Question
A 20 kg ball collides head-on with a 40kg ball, which is initially stationary. The collosion is inelastic. Which statement is true?
The magnitude of the change of the velocity the 20kg ball exp is less than that of the 40 kg ball
The magnitude of the change of the velocity the 20kg ball exp is equal to that of the 40kg ball
The magnitude of the change of the velocity the 20kg ball exp is greater than that of the 40 kg ball
The magnitude of the change of the momentum of 20 kg ball is equal to the magnitude of the change of momentum of the 40 kg ball
Two of the above statements are true
Explanation / Answer
In inelastic coliision momemtum is conserved bit not kinetie enrtgy
total momentum before collision =total momentum after collision
m1u1+m2u2=m1v1+m2v2
20 x u1+0=20 v1+40 v2
20(u1-v1)=40 v2
u1-v1=20v2
the magnitude of the change of the velocity the 20 kg ball exp is less than that of the 40kg ball is true
the magnitude of the change of the momentum the 20 kg ball exp isequal to the magnitude of the change of momentum of the40kg ball is true
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