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if a falling rock undergoes a delta v of -98(m)/(s) due to an bar (a) of -9.8 m/s^2 how long did it fall? a 9.8 seconds b 20 seconds c

Question

If a falling rock undergoes a Delta v of -98(m)/(s) due to an bar (a) of -9.8 m/s^2 how long did it fall? a 9.8 seconds b 20 seconds c 10 seconds d 5 seconds

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4.7 (253 Votes)
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Hannah Professional · Tutor for 6 years

Answer

### c. 10 seconds

Explanation

## Step1: Identify the given values### We are given the change in velocity ( ) and the acceleration ( ). Specifically, and .## Step2: Use the kinematic equation### The kinematic equation that relates change in velocity, acceleration, and time is . We need to solve for time ( ).## Step3: Solve for time### Rearrange the equation to solve for : Substitute the given values: