v0 = initial velocity
v = final velocity
a = acceleration
t = time
a = 9.80665 m/s2
The velocity calculator uses the equation that the final velocity of an object is equal to its initial velocity added to its acceleration multiplied by time of travel. This calculator does assume constant acceleration during the time. This calculator can be used to find initial velocity, final velocity, acceleration, or time as long as three of the variables are known.
A car approaching a school zone slows down from 27 m/s to 9 m/s with constant acceleration -2 m/s2.
How much time is required to slow down?
Answer: We know initial velocity (v0 = 27), velocity (v = 9) and acceleration (a = -2)
We first need to solve the velocity equation for time (t):
v = v0 + at
v - v0 = at
(v - v0)/a = t
Plugging in the known values we get,
t = (v - v0)/a
t = (9 m/s - 27 m/s) / -2 m/s2
t = -18 m/s / -2 m/s2
t = 9 s
Solving for the different variables we can use the following formulas: