- .A body of mass m sliding along a frictionless surface collides with another body of mass m, which is
stationary before impact. The two bodies stick together. If the kinetic energy of the two-body
system is E, what is the initial velocity of the first mass before impact?
(A)
(B)
(C)
(D)
(E)
- .A hockey puck of mass m is initially at rest on a frictionless ice rink. A player comes and hits the
puck, imparting an impulse of J. If the puck then collides with another object of mass M at rest and
sticks to it, what is the final velocity of the two-body system?
(A)
(B)
(C)
(D)
(E)
Que st io ns 9 and 1 0 re fe r t o t wo 1 k g masse s movi ng t oward e ach ot h er, o ne mass wi th
vel oci ty = 1 0 m/s, t he o t he r wi t h ve lo ci ty = 2 0 m/s.
- .What is the velocity of the center of mass?
(A)0 m/s
(B)5 m/s to the left
(C)10 m/s to the left
(D)15 m/s to the left
(E)20 m/s to the left
- .What is the total energy of the system?
(A)50 J
(B)150 J
(C)200 J
(D)250 J
(E)400 J
Explanations
