Please Help!!! A stone is released from a balloon that is descending at a constant speed of 10 m/s. Neglecting air resistance, after 20 s the speed of the stone is:

Question

anonymous · Answer

gravity constant is 10 m/s^2 ?

anonymous · Answer

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anonymous · Answer

after 1 second, 0 speed, 19 s after that 19*10 = 190 m/s
(no air resistance)

anonymous · Answer

The answer should be 206

anonymous · Answer

I used the formula v= v(initial) + at

anonymous · Answer

dont forget the direction

anonymous · Answer

For kinetic problems, I believe you take direction into consideration for acceleration, but what about velockty?

anonymous · Answer

the speed is initially 10 m/s upwards

anonymous · Answer

so it takes 1 second to "lose" that speed

anonymous · Answer

then it starts accelerating downwards for 19 seconds

anonymous · Answer

my problem was that i put -10 instead of 10

anonymous · Answer

why is velocity positive if it's going down

anonymous · Answer

either way is right

anonymous · Answer

if it's a negative, you get 196

anonymous · Answer

that's an answer choice as well

anonymous · Answer

a = 9.81 ?

anonymous · Answer

yeah

anonymous · Answer

then it's right, i assumed 10.0

anonymous · Answer

19 second at 9.81 m/s^2

anonymous · Answer

the right answer is 206. you see my dilemma?

anonymous · Answer

Yeah i see, but it's wrong :)