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Find an expression for, the acceleration...

Find an expression for, the acceleration and speed of a trolley A under the action of a constant force F if it contains sand that pours out through the floor at the rate of `mu` per second. The speed of the trolley at t=0 was v=0 and the initital mass of sand and trolley was `M_(0)`

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The correct Answer is:
`v=(F)/(mu)" In"(M_(0))/(M_(0)-mut)`
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