A 10-kg mass is raised above the ground so that its potential relative to the ground is 200 joules. If the mass is then dropped, then what is the speed of the of object just before it hits the ground?

• 8.4 m/s

• 20 m/s

• 2 m/s

• 6.3 m/s

Which of the following represent scalar quantities. Select all that apply:

• Displacement

• Speed

• Distance

• Acceleration

An object is shot vertically upward with an initial speed of 8 m/s. What is the maximum height of the object?

• 3.2 meters

• 6.4 meters

• 0.4 meters

• 16 meters

A car moving at 12 m/s increases its speed to 20 m/s in 5 seconds. What was its acceleration during this interval?

• 2.4 m/s²

• 4 m/s²

• 40 m/s²

• 1.6 m/s²

What is the reading of the scale?

• 50 N

• 25 N

• 0 N

• 100 N

An object with an non-zero speed of v moves up an incline. Gravity is doing what type of work on the object?

• Positive

• Zero

• Negative

• Undefined

An object is moving with a velocity v on a horizontal surface with a non-zero coefficient of friction. What type of work is gravity doing on the object?

• positive

• zero

• negative

• undefined

A simple pendulum is moved from a height of h to a height of h + k where k > 0. The period of the pendulum will be:

• The Same

• Shorter

• There is not enough information to determine an answer.

• Longer

A car traveling at a constant speed of 50 m/s, drives around a circular track of radius 250 meters. What magnitude of acceleration does it experience?

• 1 m/s²

• 10 m/s²

• zero

• 2.2 m/s²

A ball that is thrown upward will experience what acceleration when it reaches its greatest height?

• 2g

• zero

• g

• 0.5g