7a. [4 marks] Cars I and B are on a straight race track. I is moving at a constant speed of and B is
initially at rest. As I passes B, B starts to move with an acceleration of.
I passes B
B passes !
1
> 45ms-
> 45ms-1
B
at rest, begins to move
B
At a later time B passes I. You may assume that both cars are point particles.
Show that the time taken for B to pass I is approximately 28 s.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.

How can you measure the amplitude of a longitudinal wave?

Ivana walks 2km north then turns around and walks 3km south