Which of the following is an example of the electrostatic force acting in an atom?
a. an electron repelling a proton
b. a proton repelling another proton
c. a neutron repelling an electron
d. a neutron repelling another neutron

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If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s