Comments on End-of-year test, Physics, 29-5-2008

SL+HL 23
Wrong graph. 
The lower point of the curve should have been positioned at t = 0.7; v = -4 m/s.
Assuming start on the way up at v = -3 m/s the answers become:
b ii: 0.6 m
c: (-)1.8 kg m/s
d: 18 N
g: Greater force means shorter contact time and/or larger exchange of momentum. 
A hard rubber ball means shorter contact time, but as we in principle do not know the elasticity of the ball we cannot conclude anything about the speed leaving floor (probable they think of a hard rubber ball with high elasticity and then the speed will be greater).

TM

