A heavy stone of 8 kg is dropped into a lake, hitting the water with a speed of 7 m/s. Assuming we have a drag force of the bv with b = 120 kg/s, how long does it for the stone to reach 10% of its original speed? Please use g = 9.8 m/s^2.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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