5 (b) A smooth sphere A moving with speed u,
collides with an identical smooth sphere B
which is moving in a perpendicular
direction with the same speed u.
The line of centres at the instant of
impact is perpendicular to the direction
of motion of sph
5. (a) A smooth sphere P, of mass 3m, moving
with speed u, collides directly with a
smooth sphere Q, of mass 13m, which is
at rest. Sphere Q then collides with a
vertical wall which is perpendicular to the direction of motion of the spheres.
A scale pan is suspended from a ﬁxed point P by a light
elastic spring. A particle Q’of mass 0.2 kg is attached to the
pan with glue. The pan is pulled down from its equilibrium
position and set in motion. Given that the motion of Q is
simple harmonic, wi
5 (b) A smooth sphere A, of mass 4 kg, moving
with speed u, collides with a stationﬂ A
smooth sphere B of mass 8 kg.
The direction of motion of A, before impact,
makes an angle a with the line of centres at
The coefﬁcient of restitution betwee
5. (a) A smooth sphere P, of mass m kg, moving with speed 2a m/s collides directly
with a smooth sphere Q, of mass 2m kg, moving in the same direction with
speed u m/s.
The coefﬁcient of restitution between the spheres is e.
(i) Find, in terms of e, the s