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If you are referring to initial velocity with vi, then

Vfinal = Vinitial + a*t, where a is a constant acceleration, and t is the time.

So you must know a t and Vfinal to find Vinitial

Q: How would you find vi using acceleration formula?

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The acceleration of the car can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. Given the initial velocity (A), final velocity (B), and time (8 seconds), you can substitute the values into the formula to find the acceleration.

The acceleration formula is typically found in physics textbooks or online resources related to kinematics or dynamics. It is commonly given as a = (v_f - v_i) / t, where a represents acceleration, v_f is the final velocity, v_i is the initial velocity, and t is the time taken.

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You can find the acceleration of a pushed object by dividing the net force acting on the object by its mass, using the formula a = F/m, where a is the acceleration, F is the net force, and m is the mass of the object.

You can find acceleration by using the formula: acceleration = (change in velocity) / (time taken) or a = (v2 - v1) / t. Once you have the acceleration, you can find the force using Newton's second law: force = mass x acceleration or F = m*a.

The acceleration of recoil can be calculated using Newton's second law, which states that force equals mass times acceleration (F = m*a). By rearranging the formula to solve for acceleration (a = F/m), we find that the acceleration of recoil in this scenario would be 0.5 m/s^2.

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You can calculate the time to accelerate using the formula, time = (final velocity - initial velocity) / acceleration. To do this, you need to know the initial velocity, final velocity, and acceleration of the object. Plug these values into the formula to find the time it takes to accelerate.

You would use the formula F = ma, where F is the force applied (65 N), m is the mass of the boulder (10 kg), and a is the acceleration. Rearranging the formula to solve for acceleration, you get a = F/m. Plugging in the values, the acceleration of the boulder would be 6.5 m/s^2.

Use the formula Acceleration = (final velosity - initial velocity)/ time.

Find out the time using speed and acceleration, (time=speed/acceleration) and then use it to find out uniform velocity. From that find out uniform acceleration. (as uniform acceleration is equal changes of velocity over equal intervals of time)