How do we do question 3 and 4? Practice NF distance the car travels dufing ths t

Question

How do we do question 3 and 4? Practice NF distance the car travels dufing ths tmf6.6 m/s in 6.5s. Find the 2. When Mag 1. A car accelerat gie applies the brakes of her car, the car slows uniformly from 15.0 m/s Vi O m/s in 2.50 s. How many meters before a stop sign must she apply her brakes in order to stop at the sign? How long will it take for the car to accelerate uniformly to a stop in exactly 99 m? 3.2 km in 3.5 min. How fast (in m/s) is the car moving after this time? 3. A driver in a car traveling at a speed of 21.8 m/s sees a cat 101 m away on the road. 4. A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for

Explanation / Answer

3) v^2 - u^2 = 2aS

0 - 21.8^2 = 2*a*99

a = -2.4 m/s2

v = u + at

0 = 21.8 - 2.4t

t = 9.08 s

4) acceleration = 3200 / 3.5*60 = 15.23 m/s2

v = u + at

v = 6.4 + 15.23*(3.5*60) = 3206.4 m/s

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