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Physics 1101 In-Class Problems: 1D Kinematics

  1. Initially, a ball has a speed of 5.0 m/s as it rolls up an incline. Some time later, at a distance of 5.5 m up the incline, the ball has a speed of 1.5 m/s DOWN the incline.
    (a) What is the acceleration? What is the average velocity? How much time did this take?
    (b) At some point the velocity of the ball had to have been zero. Where and when did this occur?

  2. A bullet in a rifle accelerates uniformly from rest at a = 70000 m/s2. If the velocity of the bullet as it leaves the muzzle is 500 m/s, how long is the rifle barrel? How long did it take for the bullet to travel the length of the barrel? What is the average velocity of the bullet?

  3. A red car is stopped at a red light. As the light turns green, it accelerates forward at 2.00 m/s2. At the exact same instant, a blue car passes by traveling at 62.0 km/h. When and how far down the road will the cars again meet? Sketch the d versus t motion for each car on the same graph. What was the average velocity of the red car for this time interval? For the blue car? Compare the two and explain the result?

  4. A speeding motorist traveling down a straight highway at 110 km/h passes a parked patrol car. It takes the police constable 1.0 s to take a radar reading and to start up his car. The police vehicle accelerates from rest at 2.1 m/s2. When the constable catches up with the speeder, how far down the road are they and how much time has elapsed since the two cars passed one another?

  5. A ball is thrown up into the air with an initial velocity of 12.0 m/s. How long will it be in air? To what maximum height will it rise?

  6. A ball is thrown up into the air and returns to the same level. It is in the air for 3.20 seconds. With what initial velocity was it thrown? How high did it rise?

  7. Two balls are thrown upwards from the same spot 1.15 seconds apart. The first ball had an initial velocity of 15.0 m/s and the second was 12.0 m/s. At what height do they collide?

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