A piece of chalk is tossed vertically upward by Prof. Schwarzenegger and hits the ceiling 98 feet above with a BANG. (Neglect the effects of air resistance. Round your answers to two decimal places.) (a) What is the minimum speed the piece of chalk must have been traveling to enable it to hit the ceiling? ft/s (b) Assuming that Prof. Schwarzenegger in fact tossed the piece of chalk up at 98 ft/s, how fast was it moving when it struck the ceiling? ft/s (c) Assuming that Prof. Schwarzenegger tossed the chalk up at 98 ft/s, and that it recoils from the ceiling with the same speed it had at the A piece of chalk is tossed vertically upward by Prof. Schwarzenegger and hits the ceiling 98 feet above with a BANG. (Neglect the effects of air resistance. Round your answers to two decimal places.) (a) What is the minimum speed the piece of chalk must have been traveling to enable it to hit the ceiling? ft/s (b) Assuming that Prof. Schwarzenegger in fact tossed the piece of chalk up at 98 ft/s, how fast was it moving when it struck the ceiling? ft/s (c) Assuming that Prof. Schwarzenegger tossed the chalk up at 98 ft/s, and that it recoils from the ceiling with the same speed it had at the

8 years ago-16t^2 + Vt = 98 -16t^2 + Vt -98 = 0

8 years agohmmmm

8 years agois that one of the answers?

8 years agothis is a study group right?

8 years agoits a thought i have as to what an answer might be, but i havent got to the end of the thought yet

8 years agothe derivative of that position formula tells us the speed, the velocity, at any given moment

8 years agoso when it is at 0 we know that is the least amount of velocity needed to hit the ceiling

8 years agoim sorry i just have no idea what to do for this problem any ideas help

8 years ago-16t^2 + Vt -98 = 0 -32t + V = 0 when t = V/32 .... so we could sub that back in to "t" to see if that helps out with the V

8 years agohttp://www.wolframalpha.com/input/?i=simplify+-16%28V%2F32%29^2+%2B+V%28V%2F32%29+-98 the wolf simplifies nicely :)

8 years agoso which answer goes with a, b, and c? hahaha

8 years agowhen we solve this for V we only got one good option: 56sqrt(2) i beleive

8 years agoI believe a is 56sqrt(2); but id have to dbl chk it with the wolf

8 years agothe 56th square root of 2?

8 years agono, 56 times the sqrt(2)

8 years agob and c are physics parts that i am not familiar with

8 years agogood luck with the rest of it, or if you have any questions about part a let me know

8 years agowow a was right thank you so much

8 years agoyay!! lol

8 years agohaha thanks so much

8 years agocan you solve it for 105 feet by any chance?

8 years ago