a car is traveling at 20m/s along a road. a child runs out into the road 50 m ahead and the car driver steps on the break. what must the car’s decelaration be if the car is to stop just before it reaches the child.
a car is traveling at 20m/s along a road. a child runs out into the road 50 m ahead and the car driver steps on the break. what must the car’s decelaration be if the car is to stop just before it reaches the child.
Answer:
4 m/s²
Explanation:
[tex]v {}^{2} = {u}^{2} + 2as \\ 0 {}^{2} = {20}^{2} + 2a(50) \\ a = – 4ms {}^{ – 2} [/tex]
Therefore, deceleration = 4 m/s²