Two cars are moving in the same direction (the positive direction) on a straight road. The acceleration of each car also points in the positive direction. Car 1 has a greater acceleration than car 2 has. Which one of the following statements is true? The velocity of car 1 is always greater than the velocity of car 2. o In the same time interval,the velocity of car 1 changes by a greater amount than the velocity of car 2 does. The velocity of car 2 is always greater than the velocity of car 1. o In the same time interval,the velocity of car 2 changes by a greater amount than the velocity of car I does.

A car and a train move together along straight, parallel paths with the same constant cruising speed vo. At t = 0 the car driver notices a red light ahead and slows down with constant acceleration -a0. Just as the car comes to a full stop, the light immediately turns green, and the car then accelerates back to its original speed v0 with constant acceleration a0. During the same time interval, the train continues to travel at the constant speed v0. How much time does it take for the car to come to a full stop? How much time does it take for the car to accelerate from the full stop to its original cruising speed?

INTERACTIVE LECTURE DEMONSTRATION PREDICTION SHEET-PROJECTILE MOTION Directions: This sheet will be collected. Write your name at the top to record your presence write and participation in these demonstrations. Follow your instructor's directions. You may whatever you wish on the attached Results Sheet and take it with you. +y Today's physical demonstration involves a ball thrown in the air with an initial velocity upward and to the right. The trajectory of the ball looks approximately like the sketch to the right. Note that the origin of the coordinate system has been chosen to be the initial position of the ball. 0

Consider two cars driving parallel to each other down a long, straight road. At one instant in time, car A is 204 m ahead of car B. At this instant, car A is moving at 18 m/s while car B is moving at 14 m/s. B Answer: 204 m Answer: A If car A is moving with a constant velocity and car B is accelerating uniformly at 2.6 m/s², ... (a) how much time passes before car B overtakes car A? (b) how far does car A travel before car B overtakes it? Answer: (unit) (unit) (c) how far does car B travel before it overtakes car A? A (unit) B

Two boats leave the pier P at the same time and travel in the directions shown in (Figure 1). A = 42 ft/s and VB = 30 ft/s. gure 30P 4.5 "/", "=30ft/k 1 of 1 > Part A Determine the magnitude of the velocity of boat A relative to boat B. Express your answer to three significant figures and include the appropriate units. VA/B Submit Part B t = Submit ī Provide Feedback μA Value Request Answer How long after leaving the pier will the boats be 1600 ft apart? Express your answer in minutes to three significant figures. |Π|ΑΣΦ11 vec 4 → → ⒸIE ? Request Answer Units ? min

I need help on P2.19.