A motorist is driving at 20 m/s when she sees that a traffic light 200 m ahead has just turned red. She knows that this light Jestays red for 15 s, and she wants to reach the light just as it turns green again. It takes her 1.0s to step on the brakes and begin slowing. What is her speed as she reaches the light at the instant it turns green?

| A rock is tossed straight up from ground level with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. a. What is the rock's velocity as it hits the bottom of the hole? b. How long is the rock in the air, from the instant it is released until it hit's the bottom of the hole? bait driftand hip #4. II A car traveling at 30 m/s runs out of gas while traveling up a 10' slope. How far up the hill will it coast before starting to roll back down? #5. Particles A. B. and C move along the x-axis. Particle C has an initial velocity of 10 m/s. In FIGURE P2.37, the graph for A is a position-versus-time graph; the graph for B is a velocity-versus- time graph: the graph for C is an acceleration-versus-time graph. Find each particle's velocity at / = 7.0 s. rimi Particle A v, (m/s) Particle B 301 30- 20 20- 10- 10- 0 2 2 5 -10 -10- -20 -20 -30 -30 910 a, (mist) V Particle C 30- 20 10 -1 (8) -10 2 6 8 -20 FIGURE P2.37 -30