A 1.2 kg ball drops vertically onto a floor, hitting with a speed of 25 m/s. It rebounds with an initial speed of 10 m/s. a) What impulse acts on the ball during the contact? b) If the ball is in contact with the floor for 0.020 s, what is the magnitude of the average force on the floor from the ball? c) why is 25m/s "negative" ? why is it considered the initial velocity yet it will be considered negative?

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