Driving down the road at a speed of 24.6 m/s, you suddenly
notice a fallen tree blocking the road a distance of 91.0 m ahead
of you. You step on the brake pedal and decelerate at a constant
rate. What must the magnitude of your acceleration be so that you
will come to a stop 7.3 m in front of the tree?
7.23 m/s^2
3.62 m/s^2
3.33 m/s^2
3.08 m/s^2
An unidentified flying object (UFO) is observed to travel a
total distance of 42000 m, starting and ending at rest, over a
duration of 2.91 s. Assuming the UFO accelerated at a constant rate
to the midpoint of its journey and then decelerated at a constant
rate the rest of the way, what was the magnitude of its
acceleration? Express your answer in g s , where 1 g = 9.81
m/s^2.
1,011 g s
19,839 g s
9,920 g s
2,022 g s