The diagram represents speed-time for a sky diver. He falls freely from an aircraft then opens a parachute and later lands safely on the ground. At which point did the parachute fully open?
It's also not drawn quite right at the end. The speed definitely does not increase at any point after B.
My guess was B but it turned out to be C.
The answer presented:
The sky diver is falling under gravity known as free-falling at the beginning. The speed of the sky diver increases with time with decreasing acceleration till point B. The speed decreases when the parachute opens at point B. The parachute fully opens at point C.
Note: This questions ask (sic) which point did the parachute fully opened (sic), not when did the parachute just opened, (sic) which is point B.
Questions:
In what way does a parachute not "fully" open?
Is C necessarily THE point between B and D wherein the parachute fully opens? I was thinking C is merely the closest answer among A, B, C and D.
Why does the diver speed up at a decreasing rate? Since the acceleration due to gravity is constant, I was thinking that the diver speeds up constantly.