Q1) A driver in a 1000 kg car traveling at 25 m/s slams on
the brakes and skids to a stop. If the coefficient of friction
between the tires and the level road is 0.80, how long (in m) will
the skid marks be?
Q2) A 40-kg box is being pushed along a horizontal surface.
The coefficient of static friction between the box and the ground
is 0.65, and the coefficient of kinetic friction is 0.36. What
horizontal force (in N) must be exerted on the box for it to
accelerate at 1.1 m/s2?
Q3) A 8 kg box slides down an inclined plane that makes an
angle of 30° with the horizontal. If the coefficient of kinetic
friction is 0.24, at what rate does the box accelerate (in
m/s2) down the slope?
show All of the workings please