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What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

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

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two