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Susan is bicycling at a constant speed of 4.50 m/s, when David suddenly jumps in her...

Susan is bicycling at a constant speed of 4.50 m/s, when David suddenly jumps in her path 4.00 m ahead. It takes Susan 0.3 s to react and apply brakes, which slows her down to a stop.

a. Determine the minimum acceleration needed to avoid a collision.

b. How long (in seconds) does it take Susan to stop including her reaction time?

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