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A model air rocket with a mass of  50.g50.g is free to travel along a horizontal track....

A model air rocket with a mass of  50.g50.g is free to travel along a horizontal track. It begins from rest. After 2.0s2.0s, the rocket has lost 10%10% of its mass by expelling air at an average velocity of 53.m⋅s−153.m⋅s−1. What is the velocity of the rocket at that moment? Give your answer in m⋅s−1m⋅s−1to two significant figures, without a unit.

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