Questions 1-2 An astronaut hits a golf ball of mass m on the Moon, where there i

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Questions 1-2

An astronaut hits a golf ball of mass m on the Moon, where there is o atmosphere and the acceleratiion due to gravity is g/6, where g is the acceleration due to gravity on Earth. Asuume that the golf club is in contact with the ball for a time t. Just after losing contact with the club, the ball has an initial speed v directed at an angle (theta) above the horizontal.

1. What is the magnitude of the average force exerted by the club on the ball during contact?

A) mvcos(theta)

B) (mv)/t

C) mv

D) (mg)/6

E) (mg)/6cos(theta)

2. What is the work done by the club on the ball?

A) 6(1/2mv^)

B) (1/6)(1/2mv^)

C) (1/2)mv^

D) (1/2)m(vsin(theta))^

E) (1/2)m(vcos(theta))^

Explanation / Answer

1) Here, average force = rate of change in momentum of ball

=>    magnitude of the average force exerted by the club =   (mv)/t

2)    work done by the club on the ball = (1/2) * m * v2

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