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

In summary, initial velocity is the speed at which an object begins moving and is an important factor in determining the motion and trajectory of an object. It can be calculated using the formula v = u + at, with the unit of measurement being meters per second. Initial velocity can be negative, indicating movement in the opposite direction, and it impacts an object's trajectory by determining its angle and speed. A higher initial velocity results in a longer and higher trajectory, while a lower initial velocity results in a shorter and lower trajectory.
  • #1
tennis38
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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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  • #2
The final velocity is zero, the car comes to a stop.
 

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

1. What is initial velocity and why is it important?

Initial velocity is the speed at which an object starts moving. It is important because it is a key factor in determining the motion of an object and can help us understand how the object will behave over time.

2. How do you calculate initial velocity?

To calculate initial velocity, you can use the formula v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time. Rearranging the formula to solve for u, we get u = v - at. In this case, we can use the given values of 9.8m for acceleration and 4.7m/s for final velocity to solve for the initial velocity.

3. What is the unit of measurement for initial velocity?

The unit of measurement for initial velocity is meters per second (m/s).

4. Can initial velocity be negative?

Yes, initial velocity can be negative. A negative initial velocity indicates that the object is moving in the opposite direction of the positive direction, which is typically considered to be the right or upward direction.

5. How does initial velocity impact an object's trajectory?

Initial velocity plays a crucial role in an object's trajectory. It determines the angle and speed at which an object moves, which affects its path and eventual landing point. A higher initial velocity will result in a longer and higher trajectory, while a lower initial velocity will result in a shorter and lower trajectory.

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