Initial Velocity Calculation Help: Find V0 from 9.8m & 4.7m/s/s

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SUMMARY

The discussion centers on calculating the initial velocity (V0) of a car that decelerates at 4.7 m/s² over a distance of 9.8 meters until it comes to a complete stop. The final velocity (Vf) is established as zero since the car stops at the stop sign. Using the kinematic equation V0² = Vf² + 2a * d, where 'a' is the deceleration and 'd' is the distance, the initial velocity can be calculated as V0 = √(0 + 2 * (-4.7) * 9.8), resulting in an initial velocity of approximately 9.8 m/s.

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  • Ability to perform square root calculations
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A car drives at constant velocity on a road. As it comes near a stop sign, the driver brakes, which makes the car decelerate at 4.7 m/s/s. If the car traveled 9.8 METERS while the driver was braking, what was the starting or initial velocity just when the driver was hitting the brakes?

I can't find initial velocity because I can't find the final velocity here. Help please.
 
Last edited:
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The final velocity is zero, the car comes to a stop.
 

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