# A paraglider is flying horizontally at a constant speed.Assume that only two forces act on it in the vertical direction,its weight and a vertical lift

A paraglider is flying horizontally at a constant speed.Assume that only two forces act on it in the vertical direction,its weight and a vertical lift force exerted on its wings by theair. The lift force has a magnitude of 1800 N.
(a) What is the magnitude and direction of the force that theparaglider exerts on the earth ?
(b)If the lift force should suddenly decrease to 1200 N, whatwould be the vertical acceleration of the glider ? For bothquestions, take the upward direction to be the + y direction.
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hosentak

Let us assume that the skier is falling in the - y direction
The Lift force ${F}_{l\phantom{\rule{1em}{0ex}}\text{if}\phantom{\rule{1em}{0ex}}t}=1800N$
There are two forces acting on him, 1) the Lift forceacting upwards
2) his wight acting downwards
The Net Force $\sum {F}_{y}=mg-{F}_{l\phantom{\rule{1em}{0ex}}\text{if}\phantom{\rule{1em}{0ex}}t}$
According to Newton's second law, $\sum {F}_{y}=m{a}_{y}$
Or ${a}_{y}=\frac{mg-{F}_{l\phantom{\rule{1em}{0ex}}\text{if}\phantom{\rule{1em}{0ex}}t}}{m}$
$=\frac{mg-1800}{m}$
Or ${a}_{y}=g-\frac{1800}{m}$
b) If the vertical lift is reduced to 1200N, ${a}_{y}=g-\frac{1200}{m}$