A long plank begins to move at t=0 and accelerates along a straight track with a speed given by v=2 t^2 for 0 t 2 (where v is in m / s and t is in second). After 2 sec the plank continues to move at the constant speed acquired. A small bloc

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A long plank begins to move at t=0 and accelerates along a straight track with a speed given by v=2 t^2 for 0 t 2 (where v is in m / s and t is in second). After 2 sec the plank continues to move at the constant speed acquired. A small block initially at rest on the plank begins to slip at t =1 sec and stops sliding at t =3 sec . If the coefficient of static friction and kinetic friction between the plank and the blo

Quantrex Academy · Accepted Answer

Correct answer: 7

aligned & _ s ~g = dv dt at t =1 sec & _ s =0.4 aligned At t=3 sec velocities of plank and block are equal. aligned & 2+ _ k ~g (2)= v at t =3 sec =8 & _ k =0.3 & ~s + k =4+3=7 aligned

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