We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
137
5
avatar+846 

no idea where to start please help, thanks

 Mar 4, 2019
 #1
avatar
0

I cannot see the rest of question B

 Mar 4, 2019
 #3
avatar+846 
-1

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

YEEEEEET  Mar 4, 2019
 #2
avatar+101856 
+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+846 
0

thank you

YEEEEEET  Mar 4, 2019
 #5
avatar+101856 
+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

5 Online Users

avatar
avatar