A 2.0-kg laptop sits on the horizontal surface of the seat of a car moving at 8.0 m/s. The driver starts slowing down to stop. Find the mini

Question

A 2.0-kg laptop sits on the horizontal surface of the seat of a car moving at 8.0 m/s. The driver starts slowing down to stop. Find the minimum stopping distance so the computer does not slip and fall onto the floor if the coefficient of static friction between the seat and the laptop is 0.40 and the coefficient of kinetic friction is 0.20.

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Thông Đạt 1 month 2021-08-12T07:33:41+00:00 1 Answers 4 views 0

Answers ( )

    -1
    2021-08-12T07:35:40+00:00

    Answer: 32.65\ m

    Explanation:

    Given

    mass of laptop m=2 kg

    The velocity of car u=8 m/s

    The coefficient of static friction is \mu_s=0.4

    The coefficient of kinetic friction is \mu_k=0.2

    As the car is moving, so the coefficient of kinetic friction comes into play

    deceleration offered by friction \mu_kg=0.2\times 9.8\ m/s^2

    Using the equation of motion v^2-u^2=2as\\

    insert the values

    0^2-8^2=2(-0.2\times 9.8)s\\\\s=\dfrac{64}{1.96}\\\\s=32.65\ m

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