2.A table tennis ball is thrown horizontally from the top of a building. The variation of the ball's horizontal displacement s with time t is shown on the graph below.
(1)State which quantity is given by the gradient of the tangent to the graph at any time during the motion.
(2)On the graph below, sketch the expected variation of horizontal displacement with time when air resistance is ignored. The original curve is given as a dashed line.
(3)A stone is then launched with a horizontal speed of $20\,m\,s^{−1}$ from a height of 12 m above the ground. s = m
Determine the magnitude of the displacement of the stone when it hits the ground if air resistance is considered to be negligible.
