Answer:
A
Explanation:
The line(A) goes throughout the entire picture. So therefore choice A would be it's length. 
 
        
             
        
        
        
Answer:
The actual angle is 30°
Explanation:
<h2>Equation of projectile:</h2><h2>y axis:</h2>

the velocity is Zero when the projectile reach in the maximum altitude:

When the time is vo/g the projectile are in the middle of the range.
<h2>x axis:</h2>

R=Range


**sin(2A)=2sin(A)cos(A)
<h2>The maximum range occurs when A=45°
(because sin(90°)=1)</h2><h2>The actual range R'=(2/√3)R:</h2>
Let B the actual angle of projectile

2B=60°
B=30° 
 
        
             
        
        
        
<h3>
Answer:</h3>
225 meters 
<h3>
Explanation:</h3>
Acceleration is the rate of change in velocity of an object in motion.
In our case we are given;
Acceleration, a = 2.0 m/s²
Time, t = 15 s
We are required to find the length of the slope;
Assuming the student started at rest, then the initial velocity, V₀ is Zero.
<h3>Step 1: Calculate the final velocity, Vf</h3>
Using the equation of linear motion;
Vf = V₀ + at 
Therefore;
Vf = 0 + (2 × 15)
     = 30 m/s 
Thus, the final velocity of the student is 30 m/s 
<h3>Step 2: Calculate the length (displacement) of the slope </h3>
Using the other equation of linear motion;
S = 0.5 at + V₀t 
We can calculate the length, S of the slope
That is;
S = (0.5 × 2 × 15² ) - (0 × 15)
  = 225 m 
Therefore, the length of the slope is 225 m 
 
        
        
        
Answer:
(A) -2940 J
(B) 392 J 
(C) 212.33 N
Explanation:
mass of bear (m) = 25 kg
height of the pole (h) = 12 m
speed (v) = 5.6 m/s
acceleration due to gravity (g) = 9.8 m/s
(A) change in gravitational potential energy (ΔU) = mg(height at the bottom- height at the top)
height at the bottom = 0
          = 25 x 9.8 x (0-12) = -2940 J
(B) kinetic energy of the Bear (KE) =  
 
            =  = 392 J
  = 392 J 
(C) average frictional force = 
- change in KE (ΔKE) = initial KE - final KE 
- ΔKE =  - -  
- when the Bear reaches the bottom of the pole, the final velocity (Vf) is 0, therefore the change in kinetic energy becomes  ΔKE =  - 0 = 392 J - 0 = 392 J
  \frac{-(ΔKE+ΔU)}{h}[/tex] =  
 
 =   = 212.33 N
 = 212.33 N
 
        
             
        
        
        
Answer:
Because it is being stopped by another person