How much force does a 35 kg child have that is running through the house at an acceleration of 20 m/s^2?

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

If the new moon happens on january 15th, what shape will it be on february 6th?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?