A 0.058-kilogram tennis ball is thrown into the air and reaches a height of 3.5 meters. How much potential energy does it have at that height?
a. 0.203 j
b. 1.99 i
c. 0.199 j
d. 203 j

Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? a. alternating b. direct c. straight d. alternating and direct

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.