1. An object moves from x = -2.1 m, y = 3.7 m to x = 3.3 m, y = -1.1 m in a time of 5.3 s. What is its average velocity?
a) 1.4 m/s, 42° below the positive x-axis
b) 4.9 m/s, 76° below the positive x-axis
c) 0.2 m/s, 32° below the positive x-axis
d) 2.5 m/s, 48° below the positive x-axis
e) 0.92 m/s, 14° below the positive x-axis
2. An object has a velocity of (5.4 m/s) - (4.8 m/s). Over a period of 1.3 s, its velocity changes to (1.7 m/s) + (5.9 m/s). What is its acceleration?
a) -(2.8 m/s^2) + (1.1 m/s^2)
b) -(3.7 m/s^2) + (11 m/s^2)
c) (3.7 m/s^2) + (11 m/s^2)
d) -(2.8 m/s^2) + (8.2 m/s^2)
e) (2.8 m/s^2) + (8.2 m/s^2)
3. A stone is thrown outward from the top of a 59.4-m high cliff with an upward velocity component of 19.5 m/s. How long is the stone in the air? Assume that it lands on the ground below the cliff, and that the ground below the cliff is flat.
a) 4.00 s
b) 5.00 s
c) 6.00 s
d) 7.00 s
e) 8.00 s
4. An airplane makes a gradual 90° turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn, the magnitude of the average acceleration of the plane is:
a) 20 m/s^2
b) 0 m/s^2
c) 14 m/s^2
d) 40 m/s^2
e) 10 m/s
5. The velocity of an object as a function of time is given by v = (12.5t - 7.2t^2) + (4.3t^3). What is its acceleration as a function of time?
a) a = (-14.4t) + (4.3t^2)
b) a = (12.5 - 14.4t) + (12.9t^2)
c) a = (5.3t) + (12.9t^2)
d) a = (-7.2) + (4.3t)
e) a = (-7.2) + (8.6t)