A 3.2 kg mass starts from the rest at the top of 30° inclined that is 6 m long.Its speed as it reaches the buttom is 30m/s.Use the

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   A 3.2 kg mass starts from the rest at the top of 30° inclined that is 6 m long.Its speed as it reaches the buttom is 30m/s.Use the energy conservative method to find the average friction force that retards the sliding motion

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