You are driving at night on a highway at a speed of 182ms

Question

Problem: You are driving at night on a highway at a speed of 18.²m/s. All of a sudden you see a deer in the road 38 m ahead.

Part A: If you can slow down at a maximum rate of 4.50 m/s2, what reaction time is required to avoid hitting the deer?

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I've been having quite a bit of trouble understanding this problem, Thank you so much for your help. Thanks.