Center of MassHard
Question
A wagon filled with sand has a hole so that sand leaks through the bottom at a constant rate λ. An external force 
acts on the wagon in the direction of motion. Assuming instantaneous velocity of the wagon to be 
and initial mass of system to be m0, the force equation governing the motion of the wagon is :
acts on the wagon in the direction of motion. Assuming instantaneous velocity of the wagon to be and initial mass of system to be m0, the force equation governing the motion of the wagon is :Options
A. = m0 
+ λ
= m0 + λB. = m0 − λ
= m0 − λC. = (m0 − λt)
= (m0 − λt) D. = (m0 − λt) + λ
= (m0 − λt) + λSolution
vr =
− 
= v − u = 0.∴ since vr = 0 so Ft =
Fnet = m
F + 0 = (m0 − μt)
∴ F = (m0 − μt)
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