+0  
 
0
39
5
avatar+777 

no idea where to start please help, thanks

 Mar 4, 2019
 #1
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0

I cannot see the rest of question B

 Mar 4, 2019
 #3
avatar+777 
0

question B is similar to a so i figured id just try it myself

YEEEEEET  Mar 4, 2019
 #2
avatar+98130 
+1

Here's the first part

 

v = u + at

Note that a = change in velocity / change in time

So...... change in velocity  / change in time =  (v  - u ) / t  

 

So we have that

 

v =   u + at

 

v = u +  [ ( v - u) / t ]  * t   

 

v = u + (v - u)

 

v = u + v - u

 

v =  v

 

cool cool cool

 Mar 4, 2019
edited by CPhill  Mar 4, 2019
 #4
avatar+777 
+1

thank you

YEEEEEET  Mar 4, 2019
 #5
avatar+98130 
+1

Second part

 

The total displacement, s,  is the green area

 

Notice that the total  shaded area of the bottom  rectangle is   u* t

 

And the area of the top rectange  is (v - u)* t

But only half of this rectangle is shaded...so....the shaded area in the top rectangle is  (1/2)(v - u) * t

 

So.....the displacement is

 

u * t + (1/2) ( v - u) *t  =

 

u * t +  (1/2)v*t  - (1/2)u*t =

 

1/2 v* t   + 1/2 u*t =

 

(1/2) ( u + v) * t    =   s

 

 

cool  cool  cool

 Mar 4, 2019

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