Question

Jules kicks a soccer ball off the ground and into the air with an initial velocity of 25 feet per second. Assume the starting height of the ball is 0 feet. Approximately what maximum height does the soccer ball reach?

A. 0.8 ft
B. 1.6 ft
C. 9.8 ft
D. 19.6 ft

I believe the answer is C? Is that correct?

Answer 1

Jules kicks a soccer ball off the ground and into the air with an initial velocity of 25 feet per second. Assume the starting height of the ball is 0 feet. Approximately, how long does it take until the soccer ball hits the ground again?

A. 0.6 sec
B. 0.8 sec
C. 1.6 secs
D. 2.8 secs

I believe the answer for this one is B? Is that correct?

Answer 2

this is physics so please post in the physics section in the future
this time I will give you the relevent formula\[v_f^2=v_i^2+2ad\]which in the case of free fall, at the top becomes\[0=v_i^2-2gh\]solve for h to get the first answer
for the second yuo will need to post in the proper section

Answer 3

I have some more questions here, if you woldn't mind chekcing them out: http://answers.yahoo.com/question/index?qid=20120406175748AARkAqy

Answer 4

This site is about teaching
ask each of those questions individually in the proper sections and you will get more help
gotta eat now. later

Answer 5

This is for the first one
h'(t) = -32t + 25
0 = -32t + 25
t = 25/32

Plug it back into the original equation.

h(t) = -16t^2 + 25t + 0
h(25/32) = -16(25/32)^2 + 25(25/32) + 0
h(25/32) = -9.766 + 19.531
h(25/32) = 9.765

Answer 6

looks good to me, but I only think in metric

Answer 7

so I'll trust that g=32ft/s^2 lol

Answer 8

That's how I found the answer, I was just checking it, this is actually for an at home study quiz for algebra.... lol

Answer 9

Physics questions on an algebra quiz, lol

Answer 10

my solution is algebraic, yours uses calculus
they are both valid
gotta go, good luck :D

Answer 11

okay, thanks for your help! :)