# physics

Tarzan, mass 85 kg, swings down on the end of a 28 m vine from a tree limb 4.4 m above the ground. How fast is Tarzan moving when he reaches the ground?

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1. Use energy conservation.

M g H = (1/2) M V^2

V = sqrt (2gH)

H is the vertical distance that he falls, 4.4 m.

g = 9.8 m/s^2

His mass will not matter. It cancels out.

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2. a car increases its speed from 50km/hr to 75km/hr in 15mintues. what is the acceleration of the car

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