1. A projectile is fired with a speed of 15m/s at an angle of elevation of 30o above the horizontal.

a) At what height will it strike a vertical wall distant 18m horizontally from the gun?

b) Find the magnitude and direction of its velocity when it strikes the wall.

2. A 2000kg car travelling at 10.0m/s collides with a 3000kg car that is initially at rest at a stoplight. The cars stick together and move 2.00m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels on both cars lock at the time of impact.

3. An interference pattern is formed on a screen when helium-neon laser light ( = 6.33 x 10-7m) is directed towards it through two slits. If the slits are 43m apart and the screen is 2.5m away, what will be the separation of adjacent dark spots?