To solve this problem, we will need the standard kinematics equation
where
v0=initial velocity (positive upwards) m/s
t=time in seconds
a=acceleration due to gravity (positive upwards) = -9.81 m/ ²
Substituting values,
distance = 0 (when it falls back on earth)
v0=42 m/s
a=-9.81 (negative means towards earth, downwards)
factor and solve
=>
t=0 (beginning of launch), or
42-(1/2)*9.81t=0 => t=2*42/9.81=8.563 s.
Time to return = 8.6 seconds (to the nearest tenth of a second)
7 you know by the example that they have up there
<h3>
Step-by step Solution:</h3>
1. <u>Divide 4 both sides</u>
2. <u>Graph the inequality</u>
A. To get the percent of students, divide the number of students who DO ride the bus (5 kids) with the TOTAL number of students (8 kids).
B. See the picture below :)