a. The labelled diagram for all the forces acting on her and gives the value of her acceleration at the very start (0 seconds), at 3 seconds, at 6 seconds is attached below.
b. If downward motion is taken as positive, the value of her acceleration change when she opens her parachute will be zero.
Acceleration is given by the ratio of Resultant or total force acting on any object and the its mass.
The resulting force will be the sum of both forces.
A base jumper steps off a very tall building but doesn’t immediately open her parachute. After 3 seconds, her velocity is 22 m/s, and after a further 3 seconds, her velocity is still 22 m/s. At 9 seconds after jumping, she opens her parachute.
a. At the times between 0 to 6 seconds. there will be only weight force acting on the jumper. The acceleration due to gravity is the acceleration with which she is falling towards the ground.
b. As she opens the parachute, the hot air starting pushing the jumper upwards and in horizontal direction movement takes place. The weight force is neglected compared to the pressure due to hot air.
Learn more about acceleration.
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