- #1

- 465

- 4

i want to know how much time it takes to reach the peak ie when v=0

m[itex]\ddot{x}[/itex]=-mg-kv

^{2}

basically, i don't know which one to use for drag, i've seen bv being used before in problems, and i've also seen kv

^{2}being used before in problems. which one do i use for this problem and when/how do i know when to use which one?

for this problem, if it's bv i can definitely do the problem. but if it's kv

^{2}, i don't know how to pursue the problem. for the above equation i gave, if it's kv

^{2}, then i can put acceleration in terms of t like dv/dt. but then when i move the RHS over to the right by dividing, i cannot do the integral because i do not have an extra v term in the numerator.