1.
A car accelerates uniformly from rest and after 12 seconds has covered 40m. What are its acceleration and its final velocity?
S - 40m
U - 0 m/s
V - ?
A - ?
T - 12seconds
How can I work out the acceleration without the final velocity - V-U/T = or even the final velocity without the acceleration? :/
The fact that I have to use one of 4 possible equations frustrates me even more.
1.
Initial velocity 5m/s, final velocity 36km/hr, acceleration 1.25m/s^2. Time and Displacement?
S = ?
U = 5
V = 36km/hr into m/s = 10
A = 1.25m/s^2
T = ?
So to work out the time, I figured equation 1 would be best as it only had one unknown:
v = u + at
To get time on its own:
v-u / a
10-5 / 1.25 = 4s
To work out the displacement (s), I figured equation 2 or 4 would be best as they are displacement equations and I have no unknowns left anyway:
Equation 4: 0.5 x (u+v) x t
0.5 x (5+10=15) x 4 = 30
Therefore, displacement must be 30m.