Question

1. A student standing on the edge of a cliff throws a rock downward at a speed of 7.5 m/s at an angle 40° below the horizontal. It takes the rock 2.4 seconds to hit the ground. How far from the base of the cliff will the rock land?

a)18 m

b)5.7 m

c)13.8 m

d)11.6 m

2. A person driving through a field has velocity components that are 30 m/s west and 20 m/s south. What is the magnitude of the overall velocity?

a)50 m/s

b)1300 m/s

c)36 m/s

d)10 m/s

3. Which of the following statements about projectile motion is/are true assuming negligible air resistance?

a)The horizontal component of the initial velocity is constant.

b)The vertical component of the initial velocity is constant.

c)The total velocity is constant.

d)More than one of the above are true.

4. A student kicks a ball so that the ball's initial velocity is 12 m/s at 60°. What is the maximum height of the ball?

a)5.5 m

b)7.3 m

c)1.8 m

d)0.5 m

5. A student standing on the edge of a cliff throws a rock downward at a speed of 7.5 m/s at an angle 40° below the horizontal. It takes the rock 2.4 seconds to hit the ground. How tall is the cliff?

a)39.8 m

b)46.2 m

c)10.2 m

d)16.7 m

6. A student launches a small 0.5 kg rocket with an initial speed of 30 m/s at an angle of 60°. Approximately how much time will the rocket spend in the air? Air resistance is negligible.

a)5.3 s

b)6.1 s

c)3.1 s

d)10.6 s

Answer 1