Answer:
option D
0 < t < 3
Step-by-step explanation:
Given in the question the equation
d = 144 - 16t²
where d is the distance
t is the time
Since, it is a descent, d should be decreasing until it reaches zero
by plugging d = 0 in the equation
0 = 144 - 16t²
-144 = -16t²
144/16 = t²
t² = 9
take square root on both sides
√t² = √9
t = ±3
since time can't be negative so we will reject -3
t = 3
This means that at 3 seconds the roller coaster was at ground but before that it was in the air
so when t < 3 Greg's car was moving in the air.
Step-by-step explanation:
<h2>1. kinetic energy = 1/2 mass× velocity²</h2>
mass= 5.2. velocity =2.4
thus, 1/2 × 5.2×2.4×2.4
<h3>= 14.97joule</h3>
<h2>2. potential energy = mass× acceleration × height </h2>
mass=5.2. height=5.8 g=9.8
=5.2×5.8×9.8
<h3>= 295.5 joule</h3>
<h2>3. mechanical energy = potential energy + kinetic energy </h2>
= 295.5+14.97
<h3>=310.47 joule</h3>
hope it helps :)
Answer:
Step-by-step explanation:
Given
Required
Find 
In trigonometry
If 
Then: 
So, we have:
Collect like terms
Solve for x
So:
Using a calculator:
Answer:
36%
1) 1/25= 0.04
2) multiply 0.04 by 9 (0.36)
