If the velocity of a runner changes from -2 m/s to -4 m/s over a period of time,

Question

If the velocity of a runner changes from -2 m/s to -4 m/s over a period of time, the runner's kinetic energy will become half the magnitude it was twice as great as it was three times as great as it was four times as great as it was need more information to calculate A soft foam pit is used for landing during the pole vault. The foam pit cushions the landing of the vaulter by reducing the friction encountered reducing the displacement during the landing increasing the friction encountered increasing the time and displacement during the landing none of the above A volleyball player (weight = 600 N) lands from a spike attempt and immediately jumps up to try for a block. When she first contacts the ground, she is moving at 3 m/s, and then as she leaves the ground for the block she is moving at 4 m/s. Her kinetic energy at first contact is

Explanation / Answer

kinetic eneryg = 1/2 mv^2

so the kinetic energy will multiply by 4

2 increasing the time and dispalcment during landing

the foam slows down the athlete in a slower rate

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