Question

help

Answer 1

i just wanted to ask you first, have you learned about projectiles already?

Answer 2

na not really.. this was a blast. my prof didn't discussed this to us

Answer 3

because if you learned that, i will know that we need to include the acceleration due to gravity since it's dealing with vertical motions. if you did not learned that yet, maybe it's only dealing with one dimension.if this is the case we will just use the velocity formula \(v=\frac{\Delta d}{\Delta t}\).
but anyways, i know it's a projectile
so i think we need to use the five kinematics equations, are you familiar with that?

Answer 4

its 4 i think? yes.. d= (Vinitial +Vfinal/T)*t

Answer 5

Vfinal/ Vinitial + at, Vf^2= Vi^2 + 2ad, d= Vinitial(time) + 1/2 at^2

Answer 6

aah, that's good then :)
okay let's start by drawing the diagram, can you do that for me?

Answer 7

diagram? im so sorry but i have no idea..

Answer 8

just draw the situation from the problem, like the stone falling

Answer 9

great:)
so next, we put our givens:
dy=200 m
ay=9.8m/s^2
v=5m/s --> not sure if this is the initial velocity, what do you think?
let's assume that it is the initial velocity
t=?

to find the time we use: \(d_y=v_it + \frac{1}{2} a_y t^2\)
substitute the givens and you will end up having a quadratic equation, so you need to use the quadratic formula to solve for "t"

note: i use subscript "y" to represent vertical component

Answer 10

okay, ill solve for t.. ill try. hehe

Answer 11

okie dokie :)

Answer 12

t1= 5.90 and t2= -6.92

Answer 13

hmmm.. i got a different answer? O.o

Answer 14

\(200= 5t + 4.9t^2\)
\( 0=4.9t^2+5t-200\)
i set [down] as positive and [up] is negative

Answer 15

i guess, i'll take the negative?

Answer 16

if you will set down as negative it should be the same
\(-200=5t -4.9t^2\)
\(4.9t^2 -5t -200=0\)

Answer 17

oops i think i messed up somewhere.. sorry.. lemme try it again

Answer 18

its -5.90 and 6.92

Answer 19

yeah you're right XD

Answer 20

so the time would be??

Answer 21

=)

Answer 22

there's no negative time, so you should take the positive

Answer 23

ah common sense silver tsk tsk haha thank you!!!!!

Answer 24

np:)

Answer 25

hmm.. not sure, it's either the height of the tower, or the velocity of the second object

Answer 26

ah yes.. yes well. hehe THANK YOU SO MUCH =)

Answer 27

(^_^)