9. A helicopter (m = 1550 kg) is cruising at a speed of 15.0 m/s at an altitude of 165 m. What is the total mechanical energy of the helicopter?

a)	1.91 106 J

b)	6.22 105 J

c)	2.31 106 J

d)	3.95 105 J

e)	2.68 106 J

10. Can an object's velocity change direction when its acceleration is constant? Support your answer with an example.Question 10 options:

a)	No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.

b)	No, this is not possible because it is always speeding up.

c)	Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example.

d)	Yes, this is possible, and a rock thrown straight up is an example.

11. A car starts from rest and accelerates at a constant rate in a straight line. In the first second the car covers a distance of 4.0 meters. How fast will the car be moving at the end of the second second?

Question 11 options:

a)

4.0 m/s

b)

8.0 m/s

c)

64 m/s

d)

16 m/s

e)

32 m/s

12. Two bicyclists travel at a uniform speed of 20 km/h toward each other. At the moment when they are 40 km apart, a bumble bee flies from the front wheel of one of the bikes at a uniform speed of 25 km/h directly to the wheel of the other bike. It touches it and turns around in a negligibly short time and returns at the same speed to the first bike, whereupon it touches the wheel and instantaneously turns around and repeats the back-and-forth trip over and over again successive trips becoming shorter and shorter until the bikes collide and squash the unfortunate bee between the front wheels. What was the total mileage of the bee in its many back-and-forth trips from the time the bikes were 40 km apart until its hapless end? (This can be very simple or very difficult, depending on your approach.) Why?

Question 12 options:

a)

20 km

b)

25 km

c)	More than 50 km

d)

50 km

e)	This problem can not be solved

Solve each question