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Dahasolnce [82]
3 years ago
7

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contac

t about 10 times that of a stiff-legged landing. In this way the average force your body experiences is Group of answer choices about 10 times as great. more than 1/10 as great. about 1/10 as great. less than 1/10 as great.
Physics
1 answer:
masya89 [10]3 years ago
5 0

Answer:

The correct option is c. about 1/10 as great

Explanation:

The problem can be understood by the concept of impulse. Impulse is a integral of force.

                                  Impulse = Force × Time

As when we bend our knees upon reaching the ground the time of contact is about 10 times that of a stiff-legged. so,

                                 (Time)_{bend} = 10 × Time

So the force will be:

                                Force = \frac{Impulse}{(Time)_{bend} }

                                Force = \frac{Impulse}{10* Time}

                                Force = \frac{1}{10} × \frac{Impulse}{Time}

Hence the force is one tenth of the total as seen by the calculation.

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Answer:

The distance between the ships changing at 6PM is 21.29Km/h

Explanation:

Ship A is sailing east at 35Km/h and ship B is sailing West at 25Km/h

Given

dx/dt= 35

dy/dt= 25

dv/dt= ???? at t= 6PM - 2PM= 4

Therefore t=4

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D•d(D)/dt = -(10)•dx/dt + 100•dy/dt

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