Just need some help with two questions:
1) Bill is standing on the flat roof of a house 6m high and Ben is on the ground vertically below. Ben throws a ball up to Bill with a speed of 16.7 m/s and Bill catches it on the way down. How long is the ball in the air and how fast is it moving when Bill catches it?
I have worked out that the speed when Bill catches it is 12.7 m/s which is correct, but am having trouble finding the time, here are the values I am using to find the time:
S= 6
U=16.7
A=-9.8
T=?
The second question is a graph question, having trouble with both a and b,
Any help would be great, thanks!