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Sphinxa [80]
3 years ago
10

A soccer player heads a ball from a height of 6 feet with an initial vertical velocity of 20 feet per second. The height h in fe

et of the ball is given by h=-16^2+20t+6 where t is the time elapsed in seconds. How long will it take the ball to hit the ground if no other players touch it?
Mathematics
1 answer:
nlexa [21]3 years ago
3 0
WE see that at time t=0 the ball's height is 6 feet so we know the origin of our coordinates is the ground (h=0 feet)  So we need to solve this quadratic equation for the value of t that makes the equation 0.   There will be 2 solutions, one will be right and the other is usually impossible (all quadratics have two roots)
Using the quadratic formula (google it if you're unfamiliar, Brainly's math editor doesn't show things like that too nicely) I get t = 1.5s.  (the other root is -0.25)

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2 years ago
Helpeoepeoeoeo show work
alukav5142 [94]

<em>IMPORTANT THIGNS TO REMEMBER:</em>

  • Has 20 lb. dog food!
  • Gives dog 1 3/5 everyday!
  • Find how much eaten after 2 days!
  • Find how much is left!

<em>ANSWER:</em>

Dog has eaten 3 1/5 after 2 days!

There is 16 4/5 left in bag!

<em>EXPLANATION:</em>

Since she gives 1 3/5 to her dog everyday and their asking for 2 days you would multiply 1 3/5 × 2 OR add 1 3/5 + 1 3/5

Which would give you 3 1/5

So, the dog has eaten 3 1/5 lb. of dog food in 2 days.

However then, you would subtract 20 lb. - 3 1/5 lb. because there is 20 lb. dog food in all and the dog has eaten 3 1/5 of it. This would give you 16 4/5 lb.

Meaning there is 16 4/5 lb. left in the bag of dog food!

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