Kinematics

Dexter throws a water balloon downward from a height of 10 meters with an initial velocity of 4.5 m/s to hit some students outside the classroom. Solve to determine the final velocity of the water balloon. (Round to the tenths place and do not include units in the answer)

On your bike you can accelerate to 18 m/s in 25 seconds. Calculate your acceleration. (Round to the hundredths place and do not include units in the answer)

You are driving at 20 m/s when you see a groundhog on the road.  You apply the brakes, which give a constant acceleration of –15.0 m/s², until you come to a stop to avoid hitting the groundhog. How long does it take you to stop? (Round to the tenths place and do not include units in the answer)

You are driving at 20 m/s when you see a groundhog on the road.  You apply the brakes, which give a constant acceleration of –15.0 m/s², until you come to a stop to avoid hitting the groundhog. How far will the car travel? (Round to the tenths place and do not include units in the answer)

A potato is fired straight up into the air with an initial velocity of 30m/s. 

  Ignoring air resistance, how high will the potato rise? (Round to the ones place and do not include units).

A potato is fired straight up into the air with an initial velocity of 30 m/s. 

How long will it take the potato to hit the ground (total time from point fired to when it hits the ground)? (Round to the ones place and do not include units).

A hot-air balloon is ascending at a rate of 5 m/s when a passenger drops a camera. If the camera is 25 m above the ground when it is dropped.

a) What is its velocity just before it lands?

b) How much time does it take for the camera to reach the ground?

(Round to the ones place and do not include units. Only include the numbers in the answer and separate your answers with a comma. i.e. 10, 5).

A baseball player hits a popfly straight up. The ball returns to the height it was hit from 8 seconds after it was hit. What was the ball's initial velocity?

• 20 m/s

• 40 m/s

• 60 m/s

• 80 m/s

Tags

NGSS.HS-PS2-1

Two identical bowling balls A and B are each dropped from rest from the top of a tall tower as shown in the diagram below. Ball A is dropped 1.0 s before ball B is dropped but both balls fall for some time before ball A strikes the ground. Air resistance can be considered negligible during the fall. After ball B is dropped but before ball A strikes the ground, which of the following is true?

• The distance between the two balls decreases.

• The velocity of ball A increases with respect to ball B

• The velocity of ball A decreases with respect to ball B

• The distance between the two balls increases.

Tags

NGSS.HS-PS2-1

Two identical bowling balls A and B are each dropped from rest from the top of a tall tower as shown in the diagram below. Ball A is dropped 1.0 s before ball B is dropped, but both balls fall for some time before ball A strikes the ground. Air resistance can be considered negligible during the fall.

How fast are balls A and B moving one second after ball A is dropped?

• Ball A: v = 0 m/s

• Ball A: v = 10 m/s

• Ball A: v = 20 m/s

• Ball B: v = 10 m/s

• Ball B: v = 20 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4