can you please help me with physics?

Question

Using a force platform it's been found that when people jump straight up as high as they can they exert a net downward force for much of the time equal to about 2.3 times their weight. Approximately what acceleration do they achieve?

Answer 1

Consider a FBD of the jumper.
If the net downward force is 2.3 times their weigh m*g
then
2.3*m*g-m*g=m*a
solve for a
a=1.3*g
or
12.75 m/s

j