Kinematics clicker questions 1

A quantity that is has magnitude and  direction is referred to as a

• vector quantity
• scalar quantity

Acceleration of an object moving at constant velocity horizontaly  

An object can be moving for 10 seconds and still have zero displacement.

• True
• False

You run from your house to a friend's house that is 3 km away. You then walk home. The distance you traveled is 6 km. What is your displacement? 

• 6  km
• 0 km

A hummingbird averages a speed of about 45 km/hour (Cool facts: They visit up to 1000 flowers per day, and reach maximum speed, while diving, up to 160 km/hour!). Ruby-throated hummingbirds take a non-stop trip across Gulf of Mexico in which they fly for 18 hours straight! How far is the trip across the Gulf of Mexico at their average speed?

• 810 km
• 2.5 km
• 3.6 km
• 360 km

A cheetah travels 75 m in 3 s. What is her velocity over the interval?

• 225 m/s
• 25 m/s 
• 0.04 m/s

An object  accelerates at 2  m/s^2. Assuming the object starts from rest, how much time does it need to accelerate to a speed of 16  m/s?

• 4 s
• 8 s
• 16 s
• 1/16 s

A car slows down from +32 m/s to +8 m/s in 4 s. The acceleration is 

• 6 m/s/s opposite the motion
• 2m/s/s in the direction of motion
• 8 m/s/s opposite the motion

A ball is thrown downward from the top of a roof with a speed of 25 m/s. After 2 s, its velocity will be:

(Choose upward as positive)

• 19.6 m/s

• -5.4 m/s

• -44.6 m/s

• 44.6 m/s

A hacky sack is thrown up into the air with an initial velocity 3 m/s. What maximum height does the hacky sack reach?

• 0.15 m

• 0.46 m

• 0.92

• 1.8 m