# ch. 3 phys 133 hW

## 15 terms

is 9.8.

15 seconds

0

20 m/s.

100 m/s.

10 m/s

### A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward.

4

### Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed will be

neither they will both hit with the same speed.

(100 - 4.9) m.

10 m/s

### A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water

is the same for each bullet.

### Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they

get farther apart.

### While a car travels around a circular track at a constant speed its

acceleration is zero, inertia is zero, velocity is zero. none of these

zero

Example: