Question

2. A Car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child?

Answer 1

Hey ____

Here is ur answer....

Initial velocity= 20m/s
Final velocity= 0 m/s
Distance travelled= 50 m

Acceleration= ?

v²=u² + 2as......(2nd eqn of motion)

0² = (20)² + 2a* 50
0= (400) + 100a
-400= 100a
-400/100 = a
-4 = a

Therefore deacceleration= 4 m/s²


Hope it helps u ☺☺☺☺