Alex goes cruising on his dirtbike. He rides 7 km north, 3 km east, 4 km north, 6 km west, 12 km south, 3 km east, and finally 1 km north. What is Alex's displacement? A. 12 km  B. 0 km

A coin that is tossed straight up into the air. After it is released, it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the acceleration of the coin during each of the stages of the coin's motion described below. Take up to be the positive direction. Answer choice J if you think that none is correct. A. The acceleration is in the negative direction and constant. B. The acceleration is in the negative direction and increasing. C. The acceleration is in the negative direction and decreasing. D. The acceleration is zero. E. The acceleration is in the positive direction and constant. F. The acceleration is in the positive direction and increasing. G. The acceleration is in the positive direction and decreasing. The coin is mo downward. OE OF OJ O C O A OD OG O B

Each of the following vectors is given in terms of its xx- and yy-components.

A rabbit runs across a parking lot on which a set of coordinate axis has been drawn. The coordinates of the rabbit’s position as a function of time t are given by:                            x = -0.3t2 + 5t + 28  and  y = 0.22t2 - 8t + 30 with t in seconds and x and y in meters. What is the velocity at t= 10 sec?      A. 0.6 i + 0.4 j   B. -0.2i +1.6j +30   C. -i - 3.6 j   D. 4i + 2j

After about 20 minutes, you begin to pick up velocity. You realize that you are headed toward a waterfall. Let’s hope it isn’t too high…. You reach the top of the waterfall traveling at 20 m/s. The waterfall is 1.6 m high. a. How long are you in the air?b. How far away from the base of the waterfall does your boat land?

A ball is thrown straight upward from a height of 3.2 m with a velocity of 13.0 m/s. a. What is the maximum height the ball reaches? b. How long does it take the ball to reach the maximum height? c. What is the total time the ball is in the air? d. With what velocity does the ball impact the surface?

A skydiverjumps out of a helicopter and falls freely for 13.3 s before opening the parachute.what is the skydivers speed in m/s when the parachute opens? B. How far below the helicopter in m is the skydiver 8.7 seconds after jumping from the plane?

A rock is dropped from the top of a building. Rock starts from rest and it takes 7 seconds to reach the ground. How far did the rock travel in 7 seonds. Ignore air drag and friction. Use g =9.8m/s2. (Don't round your answer). Choose correct answer with the correct unit.   A. 240.1 m/s   B. 240.1 m   C. 34.3 m/s   D. 34.3 m

When you sneeze, the air in your lungs accelerates from rest to approximately 150 km/h in about 0.50 seconds. a. What is the acceleration of the air in m/s²?