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A cannonball (20kg) is fired at an angle --its initial speed upon leaving is 100m/s and...

A cannonball (20kg) is fired at an angle --its initial speed upon leaving is 100m/s and the ball reaches a height of 180 meters. Assume no friction and g=10m/s2.

What is the initial kinetic energy when the ball leaves the cannon?

a.

3.6x104joules
b.

6.4x104joules
c.

1x105joules
d.

2x106joules
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Answer #1

KE = .5mv2

KE = .5(20)(1002)

KE = 1.0 X 105 J

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Answer #2

KE=1/2MV^2

=1/2*20*100^2

1*10^5

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Answer #3

K.E=0.5mv2

K.E=0.5x20x1002=1x105 joules

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