Homework help!?

Use the equation provided to solve the following.

Blocks M and m are released from rest when m is a height h above the ground. What is the speed of block m just before it hits the ground. The coefficient of kinetic friction between M and the floor is µk.

Attachment image

1 Answer

Relevance
  • NCS
    Lv 7
    3 months ago
    Favorite Answer

    Ki + Ui + Wext = Kf + Uf + ΔEth

    0 + mgh + 0 = Kf + 0 + µk*Mgh

    so

    Kf = (m - µk*M)*gh

    and also Kf = ½*(m+M)V²

    V² = 2*(m - µk*M)*g*h / (m+M)

    and for the speed, take the square root.

    If you find this helpful, please select Favorite Answer!

Still have questions? Get your answers by asking now.