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Question(s) / Instruction(s):

(part 1 of 4)
A ball of mass 0.5 kg, initially at rest, is
kicked directly toward a fence from a point
20 m away, as shown below.
The velocity of the ball as it leaves the
kicker’s foot is 17 m/s at angle of 50 above
the horizontal. The top of the fence is 7 m
high. The kicker’s foot is in contact with the
ball for 0.05 s. The ball hits nothing while in
flight and air resistance is negligible.
The acceleration due to gravity is 9.8 m/s2.
Determine the magnitude of the average
net force exerted on the ball during the kick.
Answer in units of N.

(part 2 of 4)
Determine the time it takes for the ball to
reach the plane of the fence.
Answer in units of s.

(part 3 of 4)
Hint: Consider the diameter of the ball to be
negligible.
How far above the top of fence will the ball
pass?
Answer in units of m.

(part 4 of 4)
What is the vertical component of the velocity
when the ball reaches the plane of the fence?
Answer in units of m/s.

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