# High jumper physics problem

1. May 14, 2007

### vickic

Hi, im really stuck on this question, any help would be really really helpful!!

During takeoff a 76kg high jumper experiences a GRF of 1750N acting at an angle of 70 degrees to the horizontal. Taking acceleration due to gravity to be 9.81 ms and ignoring air resistance, calculate the HORIZONTAL and VERTICAL accleration experienced by the jumper at this point in time.

I think i need to work out the net force first, but after this im completely confused. Thanks

2. May 14, 2007

### malawi_glenn

1. calc net force in x- and y composants

2. Net force = mass * acceleration, Newtons famous law.

3. May 14, 2007

### vickic

i understand the equation and got the net force to be 745.6 ??? but i dnt understand how to fo it for x (horizontal) and Y (vertical). I know this probs sounds daft but physics really isnt my strong point!!! Thanku

4. May 14, 2007

### malawi_glenn

in what direction?...

and what is GRF ?

5. May 14, 2007

### malawi_glenn

and yeah, use trigonometry.