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A car travelling at 21 m/s misses the turnoff on the road and collides into the safety guard rail.
The car comes to a totally stop in 0.55 s.
a. What is the average acceleration of the car?
b. If the safety rail consisted of a section of rigid rail, the car would stop in 0.15 s. What would be the acceleration in this case?
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Which has additional rotational kinetic energy an object with a rotational inertia of 4 kg·m 2 and an angular velocity of 8 rad/s or else an object with a rotational inertia of 8
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