B is the right answer glad I could help !!
        
             
        
        
        
Answer:
Explanation:
Let the velocity of projectile be v and angle of throw be θ.
The projectile takes 5 s to touch the ground during which period it falls vertically by 100 m 
considering its vertical displacement 
h = - ut +1/2 g t² 
100 = - vsinθ x 5 + .5 x 9.8 x 5²
5vsinθ =  222.5
vsinθ = 44.5 
It covers 160 horizontally in 5 s 
vcosθ x 5 = 160
v cosθ = 32
squaring and adding 
v²sin²θ +v² cos²θ = 44.4² + 32²
v² = 1971.36 + 1024
v = 54.73 m /s 
 
        
                    
             
        
        
        
The boy's momentum is 160 kg*m/s north.
The formula of momentum is p = mv, where p is momentum.
p = 40 kg * 4m/s north
p =160 kg*m/s north<span>Thank you for posting your question. I hope you found what you were after. Please feel free to ask me more.</span>
 
        
        
        
B explanation : they are both filled to the same pint
        
             
        
        
        
Answer:
<em>The magnitude of vector d is 16 and the angle with the x-axis is 270°</em>
Explanation:
<u>Operations With Vectors</u>
Given two vectors in rectangular components: 

The sum of the vectors is:

The difference between the vectors is:

The magnitude of  is:
 is:

The angle  makes with the horizontal positive direction is:
 makes with the horizontal positive direction is:

The question provides the vectors:



Calculate:

The magnitude of  is:
 is:

The angle is calculated by:

The division cannot be calculated because the denominator is zero. We need to estimate the correct angle by looking at the components of the vector. Since the x-coordinate is zero and the y-coordinate is negative, the vector points downwards (south), thus the angle must be -90° or 270° if the range goes from 0° to 360°.
The magnitude of vector d is 16 and the angle with the x-axis is 270°