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4. A helium balloon is tied to a 10 kg block as shown. The balloon imparts a 12 N force upward on the block.

4. A helium balloon is tied to a 10 kg block as shown. The balloon imparts a 12 N force upward on the block. The coefficient of kinetic friction at the block-surface interface is 0.3. How fast will the block be moving when it reaches the bottom of the incline if it starts from rest. 40 m 65 O

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