1. A baseball player exerts a force of 86on a ball for a distance of 0.4 mas he throws it. If the ball has a mass of 0.25 kg, what is its velocity as it leaves his hand?

2. Two particles with equal charge experience a force of 22.4 nN when they are 0.98 m apart. What is the magnitude of the charge on each particle?

3. Increasing the distance by a factor of two from a point charge will change the potential by a factor of how much?

a) 4

b) 1/2

c) 2

d) 1/4

4. Which statement best describes the PE-KE transformations for a javelin, starting from the instant the javelin leaves the thrower's hand until it hits the ground.

a) Initial KE is transformed to PE until the javelin reaches the high point of its arc. On the way back down, there is no transformation of mechanical energy. At every point in the flight, mechanical energy is being transformed into heat energy.

b) Initial PE is transformed to KE until the javelin reaches the high point of its arc. On the way back down, there is no transformation of mechanical energy. At every point in the flight, mechanical energy is being transformed into heat energy.

c) Initial KE is transformed to PE until the javelin reaches the high point of its arc. On the way back down, PE is transformed into KE. At every point in the flight, mechanical energy is being transformed into heat energy.

Initial PE is transformed to KE until the javelin reaches the high point of its arc. On the way back down, KE is transformed into PE. At every point in the flight, mechanical energy is being transformed into heat energy.

5. If a marathon runner runs 2.21 miles to the left, 7.46 miles to the right and 2.27 miles forward, then what is the final displacement of the runner? Be sure to report your answer using the proper number of significant figures.

(Please I have an hour to turn this in!)