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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

Rauhan Nov 14, 2016

#1**0 **

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

Alan Nov 14, 2016

#4**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

Alan Nov 14, 2016