PQ: 1-D Acceleration (Harder)

Question 1

A bus travels north at 90km/h and then south at 105km/h for 2.00h. The average speed of the bus is..

Answer 1

100km/h

Question 2

The driver of a car travelling at +60km/h steps on the brakes and stops in 4.0s. While braking, the average acceleration of the car in (m/s/s) is.

Answer 2

-4.2m/s/s

Question 3

A ball is thrown straight up into the air with a velocity of + 23.5 m/. After 4.5s the velocity of the ball is…

Answer 3

-20.6m/s

Question 4

If a car changes velocity uniformly from 45km/h to 90 km/h what is its acceleration in m/s.s

Answer 4

0.83m/s/s

Question 5

The acceleration of gravity on the moon is one sixth the value on Earth . An object that falls a certain distance in 12s on the Earth will fall the same distance on the moon in a time of..

Answer 5

29s

Question 6

An object is thrown upward at 20.6m/s and falls over the edge of a building. It strikes the ground 5.00s after being thrown. The height of the building is

Answer 6

19.5m

Question 7

An object is thrown upward at 31.0m/s and returns to the ground in 6.32s. The average velocity of the object for the entire trip is….

Answer 7

0m/s

Question 8

The driver of a car travelling along a highway sees a 30km/h speed limit sign up ahead. She takes her foot off the gas pedal and slows down to a rate of 2.1m/s/s for 6.0s to reach the speed limit of 30km/h. When the car started to slow how fast was it moving in km/h?

Answer 8

+75km/h

Question 9

What is the final velocity of an aircraft flying at 250km/h that accelerates uniformly at the rate of 21.5m/s/s for 2.20s ?

Answer 9

420km/h

Question 10

A hot air balloon is rising at 5.40m/s when the pilot releases a very small metal sphere. After 2.80s, how far is the sphere below the balloon assuming the balloon continues at a constant speed?

Answer 10

38.4m

Question 11

A hot air balloon is descending at 6.30m/ when the pilot releases a small sandbag. the sandbag hits the ground 3.40s later. How high was the balloon when the sandbag was released?

Answer 11

56.6m

Question 12

An object is dropped from a cliff and hits the ground 4.0s later. During the last 1.0s of its fall, what was the displacement of the object.

Answer 12

-34m

Question 13

Acceleration Test Long Answer: John is travelling at a constant 86.0km/h [north] when he notices a barrier ahead of him. His maximum acceleration during braking is 11.5m/s/s [south]. Suppose John’s reaction time before stepping on the brakes in 0.48s. How far away is the barrier is he comes to a stop just in front of the barrier?
Assume John’s speed does not change before he steps on the brakes.

Answer 13

Unsure of answer.