`v_i = v_f - "a" * "t" `

Enter a value for all fields

The Initial Velocity calculator uses the equation (v_i = v_f - at) to compute the initial velocity (v_i) of an object prior to constant acceleration (a) for a period of time (t) based on the final velocity (v_f).

INSTRUCTIONS: Choose units and enter the following:

• (v_i) initial velocity at time t = 0
• (t) time elapsed after t = 0
• (a) constant acceleration value

Initial Velocity (v_i): The calculator computes the initial velocity(v_f) in meters per second.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math/Science

The formula for the initial velocity is:

      vi = vf - a•t

where:

• vi is the initial velocity
• vf is the final velocity
• a is the constant acceleration
• t is the time of motion

Related Items:

• Final velocity
• Acceleration Due to Gravity
• Average Velocity
• Distance Traveled under constant acceleration.