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1) A ball is thrown vertically upwards with speed 10m/s from a point 2m above horizontal ground.

a) Calculate the length of time for which the ball is 3m or more above the ground.

b) Calculate the speed with which the ball hits the ground.

(I dont know why i keep getting the wrong answers!)

4) A girl throwas a ball vertically upwards with speed 8m/s from a window which is 6m above horizontal ground.

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

1.5s later she drops a second ball from rest out of the same window.

b) Find the distance below the window of the point where the balls meet.

a) Calculate the length of time for which the ball is 3m or more above the ground.

b) Calculate the speed with which the ball hits the ground.

(I dont know why i keep getting the wrong answers!)

4) A girl throwas a ball vertically upwards with speed 8m/s from a window which is 6m above horizontal ground.

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

1.5s later she drops a second ball from rest out of the same window.

b) Find the distance below the window of the point where the balls meet.

turtle2

a) Calculate the length of time for which the ball is 3m or more above the ground.

QUOTE]

Part (a) I hope my answer is correct. The time seems a bit short.

turtle2

1) A ball is thrown vertically upwards with speed 10m/s from a point 2m above horizontal ground.

a) Calculate the length of time for which the ball is 3m or more above the ground.

b) Calculate the speed with which the ball hits the ground.

a) Calculate the length of time for which the ball is 3m or more above the ground.

b) Calculate the speed with which the ball hits the ground.

Part (a) and (b)

4) A girl throwas a ball vertically upwards with speed 8m/s from a window which is 6m above horizontal ground.

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

turtle2

4) A girl throwas a ball vertically upwards with speed 8m/s from a window which is 6m above horizontal ground.

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

1.5s later she drops a second ball from rest out of the same window.

b) Find the distance below the window of the point where the balls meet.

a) Find the greatest height above the ground reached by the ball (u=8 and a=-9.8, right? what else??)

1.5s later she drops a second ball from rest out of the same window.

b) Find the distance below the window of the point where the balls meet.

The distance below the window is 0.104 m

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- repeating 1s quadratic
- what kind of laptop to bring to uni?! macs vs windows, etc.
- Failed year 12
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