Ok i have solved in this way
since S=vt, so t=S/v
Equating both equations
v-u/a= S/v
v/3.2=40/v
v(2) = 128
v= 11.31 m/sec
is this approach correct
If a car accelerates uniformly from rest at 3.2m/s(2). when the car has traveled a distance of 40. meters, its speed will be.
I tried to use equation
v-u/a= t
but there r two unknowns in this
t and v...
how to solve it
No, it is not because the formula v= S/t applies only to constant velocities.
Rather, use v= at and [/tex]S= (1/2)at^2[/tex]. (Since the car started from rest, your "u" is 0.)
In this problem, those equations become v= 3.2t and . Solve the second equation for t and put that into the first equation.