The mars rover is moving along at a speed of 2 ms it knows, Ask an Expert

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The Mars rover is moving along at a speed of 2 m/s (it knows how to motor!) in a straight line, and in its sights it spies a rock formation up ahead in its path, and it decides to stop precisely at the rock to investigate. How many of the following do you need (in addition to its velocity) to figure out whether it will stop in time at the right place: distance (x– x0); time; acceleration (braking) If the rover doesn’t brake, how long will it take to hit the rock, if the rock is 50 meters away? If the rover starts to decelerate (brake) at a = -0.2m/s2, how long will it take to stop? Will the rover be able to stop soon enough to look at the rocks? (Why or why not?)

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