18) an apple falls from a tree in a world without friction. each second the object falls \na) the same…

18) an apple falls from a tree in a world without friction. each second the object falls \na) the same distance as in the second before. \nb) a larger distance as in the second before. \nc) with the same instantaneous speed. \nd) with the same average speed. \ne) none of the above \n19) what is the acceleration of a car that goes from 0 to 15 m/s in 5 s? \na) 1 m/s2 \nb) 3 m/s2 \nc) 5 m/s2 \nd) 2 m/s2 \ne) not enough information to estimate \n20) a scalar is a quantity that has \na) color. \nb) direction. \nc) time. \nd) magnitude. \n21) a car accelerates at 2 m/s2. assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s? \na) 15 seconds \nb) 60 seconds \nc) 2 seconds \nd) 30 seconds \ne) none of the above \n22) suppose you are in a car that is going around a curve. the speedometer reads a constant 30 miles per hour. which of the following is true? \na) you and the car are accelerating. \nb) your direction is constant. \nc) your velocity is constant. \nd) your speed is changing. \n23) a car is moving east at 18 m/s. another car on the same road is moving west at 14 m/s. from the frame of reference of the car traveling west, what is the apparent speed and direction of the other car? \na) 4 m/s heading west \nb) 4 m/s heading east \nc) 32 m/s heading east \nd) 32 m/s heading west \n24) the si unit for velocity is \na) m/s2 \nb) m \nc) s \nd) m/s \n25) while riding inside of a car that is traveling at constant 55 mph due north on a perfectly flat road, you toss a quarter straight up. when the quarter is in the air, \na) it was traveling 55 mph due south \nb) it was traveling 55 mph due north \nc) it was traveling with the same vertical velocity as you \nd) it is impossible to predict where the quarter will land

Answer