Explai sir Fa sh gravit descr expla QUESTION4 A heavy truck traveling on a horiz

Question

Explai sir Fa sh gravit descr expla QUESTION4 A heavy truck traveling on a horizontal road with the speed of 20 m/s can stop at best within 100 m. This shortest distance occurs when the driver uses anti-lock brakes which means that the car brakes without skidding. What is the magnitude of the acceleration of the truck? You velo pos (a) 5.0 m/s (b) 3.5 m/s (c) 2.0 m/s QUESTION 5 You are riding on a northward-bound train, which is moving at a speed of 30 mi/hr. You walk South with speed 3 mi/hr with respect to the train. Your speed with respect to the ground would be (a) 3 mi/hr (b) 27 mi/hr (c) 30 mi/hr (d) 33 mi/hr (e) Can't tell from the information given. 30

Explanation / Answer

4) Distance = 100m

Speed = 20 m/s

To stop the final velocity will be zero. and Initial velocity = u = 20m/s

v = 0

we know that v2 - u2 = 2as

0 - 400 = 2 x a x 100

a = 2m/s2

Hence the acceleration is 2m/s2

Option c is correct.

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