Need Help? Solution to Coin on a Bench Problem

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The problem involves a coin projected with an initial speed of 6 m/s on a horizontal bench with a coefficient of friction of 0.7. After 0.3 seconds, the speed of the coin can be calculated using the formula for frictional force and acceleration. The frictional force acting on the coin is determined by multiplying the coefficient of friction by the normal force, which is equal to the weight of the coin. The final speed of the coin after 0.3 seconds is 4.1 m/s.

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Completely lost on this question, would be brilliant if someone could offer a solution. Thank you

A coin is projected with a speed of 6m/s along the horizontal surface of a bench. The coefficient of friction between the bench and the coin is 0.7. Modelling the coin as a particle and assuming no air resistance, find the speed of the coin after 0.3 seconds
 
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