Question

A toy rocket is launched vertically and remains in the air for 5.1 seconds.
a) How high did the rocket get? SHOW ALL WORK.
b) What was the initial launch speed? SHOW ALL WORK.

Answer 1

the rocket will take time to go the highest vertical height is=5.1/2sec

Answer 2

2.55 sec

Answer 3

thanks but can you explain it please? I don't really understand how to get that answer. :/

Answer 4

u will use the equation
v=u-gt
0=u-9.8*2.55
u=9.8*2.55
then u will use the equation
v^2=u^2-2* g* h

Answer 5

an object take equal time to go the highest position as go down to the ground

Answer 6

for example if a body go to the highest height by 10 sec. then it will take 10 sec for going to the ground

Answer 7

time period will b T=20 sec

Answer 8

I'm confused so I'm just going to think about this question for a while.

Answer 9

did u understand the time needed to go the heighest position by 2.55 sec

Answer 10

Well I understand that part.

Answer 11

time period T= 5.1 sec given

Answer 12

ok

Answer 13

I don't understand what formula should be used.

Answer 14

now let
u= initial velocity
t= 2.55 sec is needed to go to the heighest height
v= final velocity=0= velocity at the heighest height

Answer 15

u know
v=u-gt
0=u-9.8*2.55

Answer 16

tell me the value of u

Answer 17

Oh okay. I can picture the diagram in my head now. ^-^ Um give me a minute to write it out.

Answer 18

ok

Answer 19

Uh is it about 25?

Answer 20

ya

Answer 21

now r u able to calculate maximum height

Answer 22

I think so. Thanks. (:

Answer 23

which equation u wanna use to calculate highest height

Answer 24

Was the answer to part b) 25? or was that for part a?

Answer 25

b

Answer 26

now try to solve for part a)

Answer 27

Then I guess I don't know how to solve part a. Sorry.

Answer 28

u can use equation
v^2=u^2-2* g*H
0^2=25^2-2*9.8*H

Answer 29

now tell me the value of H

Answer 30

Is it about 32?

Answer 31

ya

Answer 32

Thanks so much!

Answer 33

but i m not sure that u understood this math

Answer 34

I understand it more than before... :P

Answer 35

good

Answer 36

anyway may i know ur country name