6.5 CHAPTER 6. MOTIONIN TWO DIMENSIONS
time (s)velocity (m·s−^1 )10
5
0
-5
-10
-15
1,0 2,0
(a) At what velocity does the boy throw the ballinto the air?
(b) What can be determined by calculating the gradient of the graph
during the first two seconds?
(c) Determine the gradient of the graph over the first two seconds.
State its units.
(d) How far below the boy’s hand does the ballhit the ground?
(e) Use an equation ofmotion to calculate howlong it takes, from
the time the ball was thrown, for the ball to reach its maximum
height after bouncing.
(f) What is the positionof the ball, measured from the boy’s hand,
when it reaches its maximum height after bouncing?- [IEB 2001/11 HG1]- Free Falling?
A parachutist steps outof an aircraft, flying high above the ground.
She falls for the first 8 seconds before opening her parachute. A graph
of her velocity is shownin Graph A below.
time (s)velocity (m·s−^1 )
40 Graph A5
0
(^4) 8 9 15 16
(a) Use the informationfrom the graph to calculate an approximate
height of the aircraft when she stepped out of it(to the nearest 10
m).