A baseball weighs 5.19 oz. what is the kinetic energy, in joules, of this baseball when it is thrown by a major-league pitcher at 96.0 mi/h? by what factor will the kinetic energy change if the speed of the baseball is decreased to 55 mi/h

Kinetic energy = 0.5*mas*velocity^2

Joules = lg*m^2/s^2

1 miles = 1608.34 meters

1 hour = 3600 Sec

1 ounce = 28.35g = 0.02836 kg

What is a the kinetic energy, in joules, of this baseball when it is thrown by a major-league pitcher at 96.0 mi/h?

Answer: KE=0.5m*v^2

=0.5 * (5.12 o * 0.02835 kg/1 ounce) * (95 miles/h*1609.34m/1 miles * 1hr/3600s^) 2

131kg*m^2/s^2 = 131 joules

By what factor with the kinetic energy change if the speed of the baseball is decreased to 55.0 mi/h?

Answer: KE=0.5*m*v^2

=0.5 * (5.13 o*0.02835kg/1 ounce) * (55 miles / h*1609.34m/1 mile*1 hr/3600s) ^2

=44.0kg*m^2s^2=44.0 joules

131/44 = 2.98, so decreased by a factor of approximately 3