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A man with mass m =70.0 kg (weight = 154.0 lbs is walking towards a patio at 2.10 m/s (4.70 mph) when, at the last moment, he realizes the sliding glass door is closed. He puts out his hand suddenly to stop himself, and comes to a halt in 150.0ms. Find the magnitude of the average force exerted on the door by his hand.

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