# Physicd

A force of 25N acts on a body at rest for 0.2s and a force of 70N acts for the next 0.1s in opposite direction .If the final velocity of the body is 5ms,the mass of the body is

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1. 7 N∙s - 5 N∙s = 2 N∙s

m v = 2 N∙s

m = 2/5 kg

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2. how do you get 7ns-5ns from the question i didn't understand

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3. I don't understand the way you solved the question

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