Chap 3 Physics Review

A race car’s forward velocity increases from 4.0 m/s to 36 m/s over a 4.0-s time interval. What is its average acceleration?

• 8.0 m/s²

• 4.0 m/s²

• 16 m/s²

• 9 m/s²

A bus is moving west at 25 m/s when the driver steps on the brakes and brings the bus to a stop in 3.0 s.

• -8.3 m/s²

• can't answer, not enough information

• -75 m/s²

• -0.12 m/s²

A car is coasting backward downhill at a speed of 3.0 m/s when the driver gets the engine started. After 2.5 s, the car is moving uphill at 4.5 m/s. If uphill is chosen as the positive direction, what is the car’s average acceleration?

• 3.0 m/s²

• 0.6 m/s²

• you really expect me to remember this?

• 7.5 m/s²

Rohith has been jogging east toward the bus stop at 3.5 m/s when he looks at his watch and sees that he has plenty of time before the bus arrives. Over the next 10.0 s, he slows his pace to a leisurely 0.75 m/s. What was his average acceleration during this 10.0 s?

• 0.28 m/s²

• 0.425 m/s²

• I am in serious trouble (but Mr. Trout will help me!!!

• 2.75 m/s²

A canoeist paddles upstream at a velocity of 2.0 m/s for 4.0 s and then floats downstream at 4.0 m/s for 4.0 s.

What is the average acceleration of the canoe during the 8.0-s time interval?

• 0.75 m/s²

• 0.25 m/s²

• need to fake Covid to go into quarantine for the final

• 2.0 m/s²

A golf ball rolls up a hill toward a miniature-golf hole. Assume the direction toward the hole is positive.

If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s², what is its velocity after 2.0 s?

• 1.0 m/s

• -1.0 m/s

• not good, not good at all (but again, don't panic, Mr Trout will help

• -0.75 m/s

If a car accelerates from rest at a constant rate of 5.5 m/s2 north, how long will it take for the car to reach a velocity of 28 m/s north?

• 5.1 secs

• 140 secs

• lets pray for a Festivus Miracle!

• 0.20 secs

A car slows from 22 m/s to 3.0 m/s at a constant rate of 2.1 m/s². How many seconds are required before the car is traveling at a forward velocity of 3.0 m/s?

• 9.0 secs

• 12.0 secs

• what, no funny incorrect answer here?!

• 7.3 secs