Probiem $4.$ A ball is thrown upwards. While the ball is in the air, $($a$)$ does its acoeteration increase, decrease or remain the same? Explain your answer. $($b$)$ Describe what happens to its velocity as accurately is you can.

Problem $5.$ The position of a pinewood derby car whe observed at various times as shown in the table below. Find the average velocity of the car for $($a$)$ the first second, $($b$)$ the last three seconds and $($c$)$ the entire period of oloservation.

$\backslash$table$[[x($iii$),0\mathrm{.}0,2\mathrm{.}3,9\mathrm{.}2,-20\mathrm{.}7,36\mathrm{.}8,57\mathrm{.}5],[+($B$),0\mathrm{.}0,1\mathrm{.}0,2\mathrm{.}0,3\mathrm{.}0,4\mathrm{.}0,5\mathrm{.}0]]$