The height of an object dropped from a 100meter tall playform at time t seconds is approximated by s(t)=-5t^2+100 (this formula is based on an approximated value for the acceleration g=10m/s^2 due to gravity.) What is the height of the object after 2 seconds? after 4 seconds?

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Answers

2016-07-07T22:12:38+08:00
After 2s: 40m
after 4s: 5m
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  • Brainly User
2016-07-07T22:20:02+08:00
A.  Height of the object at 2 seconds:
     t = 2

s(t) = -5t² + 100
s(2) = -5(2)² + 100
s(2) = -5(4) + 100
s(2) = -20 + 100
s(2) = 80 meters

B. Height of the object at 4 seconds:
    t = 4

s(4) = -5t² + 100
s(4) = -5(4)² + 100
s(4) = -5(16) + 100
s(4) = -80 + 100
s(4) = 20 meters 
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