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**1. Homework Statement**

My teacher keeps saying we can't have negative times because they don't exist and when I do these questions I get negatives and can't understand them at all, can someone help me?

1. How long does it take to slow a car from 10m/s to rest at a rate of -1.75m/s^2?

2.How long does it take to slow a car going 35m/s to 15m/s at an acceleration of -3.75m/

My teacher keeps saying we can't have negative times because they don't exist and when I do these questions I get negatives and can't understand them at all, can someone help me?

1. How long does it take to slow a car from 10m/s to rest at a rate of -1.75m/s^2?

2.How long does it take to slow a car going 35m/s to 15m/s at an acceleration of -3.75m/

**2. Homework Equations**

t=v/a

**3. The Attempt at a Solution**

1)t=v/a

t=10/-1.75

t=-5s

2) I can't understand it almost at all