A small ball made of Styrofoam packing material is dropped from a height of 3.0 m above the ground. Until it reaches terminal speed, the magnitude of its acceleration is given by a = g-bv. After falling through 1.0 m, the ball effectively reaches terminal speed and then takes 4.0 more seconds to reach the ground. The value of the constant b is (take g = 10 m/s2)

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10s-1

20 s-1

5 s-1

50 s-1

answer is B.

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Detailed Solution

when terminal speed is achieved a=0 g=bv v= g/b s=vt 2=(g/b) x4 b =2g =20

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