PhysicsBowl 2017 Q11

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PhysicsBowl 2017

11) For this question, we want to find the average velocity of the block during the described motion. Since the object is under constant acceleration, we do not need to find the distance traveled to find the average velocity.

Where v is velocity, d is distance, and t is time

Again, make sure to notice that the second equation can only be used for constant acceleration. We are given the mass and the initial and final kinetic energy of the block, so we can find the initial and final velocities.

Where K is kinetic energy, m is mass, and v is velocity

Answer: C