A racing car is traveling along a horizontal track. The car, starting from rest accelerates uniformly at 4.50ms-² for 15s when it reaches maximum speed. It then travels at this speed for 20s before deceleration uniformly at 5.60ms-² until it come to rest. i. Determine the maximum speed reached by the car
Ii. Determine the distance travelled by the car before reaching maximum speed
iii. Determine the time taken for the car to decelerate from it’s maximum speed and comes to rest
iv. Determine the total distance travelled by the car

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?