11. A motorcycle is moving at a velocity of 19.0 m/s before slamming on its brakes. The motorcycle comes to a complete stop (0 m/s). Assuming the acceleration of the
motorcycle's breaks were -7.60 m/s2, how much time did it take for the motorcycle to
stop?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s