# physic

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

1. 👍 0
2. 👎 0
3. 👁 129
1. Vo = 15m/s[35o].
Yo = 15*sin35 = 8.60 m/s.

Y = Yo + g*Tr = 0, Tr = -Yo/g = -8.60/-9.8 = 0.88 s. = Rise time.

h1 = Yo*Tr + 0.5g*Tr^2.
h1 = 8.60*0.88 - 4.9*0.88^2 = 3.77 m. Above top of bldg.

Tr+Tf = 2.7, Tf = 2.7-Tr = 2.7-0.88 = 1.82 s. = Fall time from max ht. to gnd.

h2 = 0.5g*Tf^2 = 4.9*1.82^2 = 16.2 m. Above gnd.

Hb = h2-h1 = 16.2 - 3.77 = 12.5 m = Height of the bldg.

Tr+Tf = 2.7, Tf = 2.7-Tr =

1. 👍 0
2. 👎 0
posted by Henry
2. Oops! Disregard last line of this post.

1. 👍 0
2. 👎 0
posted by Henry

## Similar Questions

1. ### physics

A brick is thrown upward from the top of a building at an angle of 10° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 2.8 s, how tall is the building?

asked by mel on February 9, 2010
2. ### physics

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 2.5 s, how tall is the building?

asked by tiffany on September 20, 2010
3. ### physics

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.1 s, how tall is the building?

asked by sid on February 21, 2012

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

asked by lisa on February 4, 2016
5. ### physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building?

asked by lisa on February 5, 2016
6. ### physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? (in m) could someone help me please!!!

asked by lisa on February 7, 2016
7. ### physics

A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.4 s, how tall is the building?

asked by kaf on January 29, 2012
8. ### physics

A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 2.5 s, how tall is the building?

asked by Anonymous on September 25, 2010
9. ### physics

A brick is thrown upward from the top of a building at an angle of 15° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 2.8 s, how tall is the building?

asked by Claudia on September 27, 2010
10. ### physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 14 m/s. If the brick is in flight for 3s, how tall is the building?

asked by TNT on February 16, 2018

More Similar Questions