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Jeje

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A projectile launched into the air can be modelled by the function h(t) =-4.9t^(2) + 4.1t + 8.2 where h(t) represents the height
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An ore car of mass 40000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 16 m lower
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U-238 has a half-life of 4.46 x 109 years. Estimates of the age of the universe range from 9 x 109 years to 23 x 109 years (Cauldrons in the Cosmos: Nuclear Astrophysics, C.E. Rolfs and W.S. Rodney, Univ. of Chicago, 1988, p. 477). What fraction of this
Rn-222 has a half-life of 3.82 days. How long before only 1/16 of the original sample remains? Solution: recognize 1/16 as a fraction associated with 4 half-lives (from (1/2)4 = 1/16) 3.82 days x 4 = 15.3 days

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