- #1

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Just after the gun a sprinter of mass 65kg is pushing against the starting block with a force of 800N. The force acts at an angle of 65 degrees to the horizontal.

Calculate:

- the resultant horizontal force acting on her

- the resultant vertical force acting on her

- the forward acceleration of her centre of gravity

- the upward acceleration of her centre of gravity

My attempt:

I'm guessing the resultant horizontal force is 0, as the starting block would exert an equal force on the runner?

Then resultant vertical force would be mass x gravity (65 x 9.8 = 637N).

But I don't know how to attempt the other two questions??