8-86. A large ball of modeling clay (mass 4.5x102 g) is
rolled on a tabletop so that it collides with a stationary small wooden
box (mass 7.9x102 g). The collision is completely inelastic,
and the ball and box then slide on the table for a distance of 5.1 cm.
If the speed of the ball is 2.2 m/s just before the collision,
determine:
(a) the speed of the ball and box just after the collision (b) the
magnitude
of the friction force acting on the ball and box.
ACCUMULATED SOLUTION
Correct
Momentum conservation tells us that for this
collision:
(A) m1v1
+ m2v2 = m1v1'
+ m2v2' where v2
= 0
(B) m1v1
+ m2v2 = (m1 + m2)v'
where v2 = 0
(C)
m1v1 = m1v1'
+ m2v2'
(D)
m1v1 = (m1
+ m2)v'