A girl wearing a parachute jumps from a helicopter. She does not open the parachute straight away. The table shows her speed during the 9 seconds after she jumps.

a. Copy and complete the table by writing down the speed at 2 seconds.

b. Plot a graph of speed against time. 

c. How many seconds after she jumped did the girl open her parachute? How do the results show this?

d.

i. What force pulls the girl down?

ii. What force acts upwards?

iii. Which of these forces is larger:

at 3 seconds? 

at 6 seconds? 

at 9 seconds? 

e. How will the graph continue after 9 seconds if she is still falling?

f. The girl makes a second jump with a larger area parachute. She falls through the air for the same time before opening her new parachute. How will this affect the graph: 

i. During the first four seconds? 

ii After this?

Transcribed Image Text:

1 2 3 4 5 6 7 8 time in seconds 0 speed in m/s 9 . 10 30 40 25 17 12 10 10