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Collision question

  • #1
collision question!!!

Speedy Sue, driving at 32.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 160 m ahead traveling with velocity 5.20 m/s. Sue applies her brakes but can accelerate only at -2.00 m/s2 because the road is wet. Will there be a collision?



If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closest approach between Sue's car and the van and enter zero for the time.




i already know there will be a collision
but im not sure how to calculate how far into the tunnel it will happen

im guessin to use the final position function..but i dunno
 

Answers and Replies

  • #2
CompuChip
Science Advisor
Homework Helper
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If Sue starts braking immediately after entering the tunnel, how far into the tunnel will she have come to a stop?
How long will it take her to brake? What is then the distance the van has travelled?
 

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