The slope on a distance-time graph shows a ball moving from 20 m to 40 min 1 s and from 40 m to 80 m in the next second.
which describes the ball's motion between 20 m and 80 m on the graph?
linear, acceleration
nonlinear, constant speed
linear, constant speed
nonlinear, acceleration

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