A 47.0 g golf ball is driven from the tee with an initial speed of54.0 m/s and r

Question

A 47.0 g golf ball is driven from the tee with an initial speed of54.0 m/s and rises to a height of25.0 m. (a) Neglect air resistance and determine thekinetic energy of the ball at its highest point.
1 J

(b) What is its speed when it is 7.0 mbelow its highest point?
2 m/s ssm One kilowatt·hour (kW·h) is the amount ofwork or energy generated when one kilowatt of power is supplied fora time of one hour. A kilowatt·hour is the unit of energyused by power companies when figuring out your electric bill.Determine the number of joules of energy in onekilowatt·hour.
1 J

Section 6.7Power (a) Neglect air resistance and determine thekinetic energy of the ball at its highest point.
1 J

(b) What is its speed when it is 7.0 mbelow its highest point?
2 m/s ssm One kilowatt·hour (kW·h) is the amount ofwork or energy generated when one kilowatt of power is supplied fora time of one hour. A kilowatt·hour is the unit of energyused by power companies when figuring out your electric bill.Determine the number of joules of energy in onekilowatt·hour.
1 J

Section 6.7Power
Section 6.7Power

Explanation / Answer

(b)Loss in potential energy is(0.047kg)(9.8m/s^2)(7m) = 3.2242J
This loss is converted intokinetic energy given by (1/2)mv2 then the speed of teh ball atheight 7m below its maximum height is v =sqrt[(2)(3.2242J)/(0.047kg)]                         = 11.7 m/s
1. 1kWh =(1000W)(3600s)       =3.6*106J

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