The ball changes to -30m/s after hitting a wall. what is the impulse? (I=Ft=change of P) Hint: finding this momentum and then subtract it with
the previous answer

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Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

What is the mass of the same rock on the earth

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?