Answer to Question #347817 in Mechanics | Relativity for PAUL JOSHUA 123

Question #347817

The formula h (t) = -4.9t² + 20t+ 80 gives the height (h) above ground in meter (m) of an object thrown at t=0, straight upwards from the top of a tower 80m height.




1)What is the height point reached by the object ?





2) After how many seconds does the object hit the ground?






This question is based on projectile.





1
Expert's answer
2022-06-03T07:54:07-0400

"h'=-9.8t+20,"

"t_0=2.04~s,"

"h(t_0)=20.4~m,"

"t=2.5~s."


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