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 m 0 , the force equation governing the motion of the wagon is :
A
= m 0 
+ λ 
B
= m 0 
– λ 
C
= (m 0 – λ t) 
D
= (m 0 – λ t) 
+ λ 
Text Solution
Verified by ExpertsThe correct answer is:
C
v r = 
– 
= v – u = 0.
∴ since v r = 0 so F t = 
= 0
F net = m 
F + 0 = (m 0 – λ t) 
∴ F = (m 0 – λ t) 
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