+0  
 
0
422
4
avatar+502 

given that the total travelled is 1.4km and the acceleration is 4/s^2 for the first T seconds, find: (a) the value of V, (b) the value of T

 Nov 14, 2016
 #1
avatar+27531 
0

Is V the final velocity, the average velocity or what?  Is the starting velocity zero?

 Nov 14, 2016
 #2
avatar+502 
0

U can say hat the V is on the x-axis and v is the speed and the starting velocity is zero.

Rauhan  Nov 14, 2016
 #3
avatar+502 
0

that*

Rauhan  Nov 14, 2016
 #4
avatar+27531 
0

I'll assume v is the final velocity, and that the acceleration is constant, in which case you can use:

 

(i) d = u*t +(1/2)*a*t^2   where d = distance,  u = initial velocity, a = acceleration and t = time

 

and

 

(ii)  v = u + a*t  

 

I'll also assume the acceleration is 4 m/s^2 

 

(i)  1400 = 0 +(1/2)*4*t^2   so  t = sqrt(700) secs  ≈ 26.5 secs

 

(ii) v = 0 + 4*t   so v = 4*sqrt(700) m/s  ≈ 106 m/s

 Nov 14, 2016

23 Online Users

avatar
avatar
avatar
avatar
avatar
avatar