Problem 2.50 Roger sees water balloons fall past his window. He notices that eac

Question

Problem 2.50

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.45 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Part A

How fast are the balloons traveling when they pass Roger's window?

Express your answer to three significant figures and include the appropriate units.

SubmitMy AnswersGive Up

Part B

Assuming the balloons are being released from rest, from what floor are they being released? Each floor of the dorm is 5.0 m high.

Express your answer as an integer.

Explanation / Answer

let the velocity at the window be u

time to reasch the sidewalk = 0.45 s

distance (s) = 10m

we know, the kinematic equation ,

S= ut + 0.5gt2

=> 10 = u*0.45+ 0.5* 9.8 * (0.45)2

=>9.00775/0.45 =u

=> u =20.017m/s

b) now let the final velocity be 20.017 m/s

initial be 0m/s

we use ,

V2-U2= 2gS

=>(20.017 )2 - (0)2 = 2* 9.8 * S

=>S= 20.443 m

so, total height= 20.44 + 10 = 30m

so the no. of floors = 30/5 = 6

so, the baloons are released from 6th floor

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.