1. You throw a ball straight up with an initial speed of 2 m/s. When the ball come back to you hand it has a speed of (ignore air-resistance):

Select one:

a. less than 2 m/s

b. greater than 2 m/s

c. 2 m/s

d. not enough information

2. The speed of a bowling ball sliding along a frictionless surface is

Select one:

a. not affected by gravity

b. constant

c. Both of the above

d. None of the above

3. When a car rounds a curve, it is:

Select one:

a. moving uniformly

b. accelerating

c. in rotational equilibrium

d. changing its speed

4. A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?

Select one:

a. 2 s

b. 15 s

c. 30 s

d. 60 s

A car slams into an identical car that is at rest. The cars stick together and keep moving forward. The speed of the coupled cars compared with the initial speed of the first car is:

Select one:

a. 12

b. 14

c. the same

d. double