Arianna kicks a soccer ball off the ground and into the air with an initial velocity of 42 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?
1.3 secs
2.6 secs
16.0 secs
27.6 secs
2 answers:
A=g
v=⌠g dt
v=gt+C, where C=v initial
v=gt+vi
h=⌠v dt
h=gt^2/2+vit+C, where C=h initial
h=gt^2/2+vit+hi
We are told that vi=42 ft/s, hi=0, and we know g≈-32 ft/s^2 so
h(t)=-16t^2+42t
The ball will hit the ground when h=0 so
-16t^2+42t=0
-2t(8t-21)=0, since t>0
8t-21=0
8t=21
t=21/8
t=2.625 sec
t≈2.6 sec (to nearest tenth of a second)
Answer:
Step-by-step explanation:
2.6 seconds is the correct answer for this problem
You might be interested in
Answer:
its B
Step-by-step explanation:
Do 5 divided by 8 to get 0.625 feet of shadow per foot of the height of the tree, which is your answer
Answer:

Step-by-step explanation:
Factor 

Rewrite Equation

Answer:
The first one is 59049. The second one is 32
Step-by-step explanation:
Answer:
24.49
Step-by-step explanation:
16.00
8.49
____
24.49