Why is it difficult to use the law of conservation of energy to calculate the
effects of a collision?
O
A. Energy is not conserved.
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B. Energy is only conserved during perfectly inelastic collisions.
O
C. The kinetic energy of the objects is converted to other forms of
energy
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D. Energy is destroyed during a collision,

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

Aballet student who learns with the of his instructor is demonstrating learning.

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?