Question

1. a) Mork while driving in his "Eggmobile" on the planet Ork
drives off a cliff **500 m** in height. If he was
moving with a horizontal velocity of **100 m/s** when
he left the cliff, determine whether or not he will crash into
Mindy who was at the time admiring Ork's landscape at a distance of
**1100** m from the foot of the cliff. **Show
all calculations !**

***NOTE:** The gravitational field (acceleration
due to gravity) on Ork is 0.5 that of the earth's gravitational
field.

b) A cannon inclined at an angle of
**30 ^{o}** above the ground is firing cannon
balls with an initial velocity of

i) Determine the time required for the balls to reach the maximum height.

ii) The velocity of the balls **2.5 s** after
firing.

iii) If a physics student was contemplating gravity underneath
an apple tree at a distance of **250 m** from the
cannon, determine whether or not he would get hit.

c) During a training exercise a cannon ball is fired with a
muzzle velocity of 89.2 m/s at an angle of 45^{o} above the
horizontal. Determine how fast the cannon ball will be moving just
before it strikes the ground.

Answer #1

Kramer decides to hit golf balls from the edge of a cliff into
the ocean. The cliff is 62.9 m high. He hits the first ball (mass
45.9 g) giving it an initial velocity of 37.5 m/s at an angle of
22.1 above the horizontal. Determine:
a) the work done on the ball by gravity on the way up to its
maximum height
b) the work done on the ball by gravity on the way down to the
ocean
Answers:...

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(b) If one of the arrows which Robin Hood fired was aimed
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A ball, mass is 8 kg, is thrown from the top of a 30 m cliff
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