For typical rubber-on-concrete friction, what is the shortest time in which a car could accelerate from 0 to 50 mph? suppose that μs=1.00 and μk=0.80. express your answer to two significant figures and include the appropriate units.

The shortest time in which the car could accelerate from 0 to 50 mph is 2.85 second.

Explanation:

Given information:

Convert the velocity in

As:

The car is having initial speed zero and reaches in a certain time

Now, considering only dynamic frictional force, since the static frictional force will act at very first moment of the motion:

As, the acceleration is given by:

; here,

on putting the values in above equation:

Hence, the shortest time in which the car could accelerate from 0 to 50 mph is 2.85 second.

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if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.