physics

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A trunk of mass 15 kg is on the floor. The
trunk has a very small initial speed.
The acceleration of gravity is 9.8 m/s2 .
What constant horizontal force pushing the
trunk is required to give it a velocity of 10 m/s
in 20 s if the coefficient of sliding friction
between the trunk and the floor is 0.58?
Answer in units of N

EXPLAIN ALSO??

ANOTHER QUESTION

1300 N a push of the box to the right
236 kg of the box
μ = 0.44
A crate is pushed horizontally with a force.
The acceleration of gravity is 9.8 m/s2 .
Calculate the acceleration of the crate.
Answer in units of m/s2

  • physics -

    1. Wt = m*g = 15kg * 9.8N/kg = 147 N. =
    Weight of trunk.

    Fk = u*mg = 0.58 * 147 = 85.26 N.=Force
    of kinetic friction.

    2. Fap = 1300 N.?
    Mass = 236 kg
    u = 0.44

    Wc = m*g = 236kg * 9.8N/kg = 2313 N. =
    Weight of crate.

    Fk = u*mg = 0.44 * 2313 = 1018 N.

    a=(Fap-Fk)/m=(1300-1018)/236=1.19 m/s^2

  • physics -

    1. The solution is incomplete.

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