- #1
wellojello
- 2
- 0
greetings :)
so I'm pretty stumped on this one question from masteringphysics:
A ball thrown horizontally at 23.7 m/s from the roof of a building lands 35.0 m from the base of the building. How high is the building?
i first listed all of my given values
---------------------------
v_x0 = 23.7 m/s
a = a_y = -g = -9.8 m/s^2
x = 35 m
x_0 = y_0 = 0
v_y0 = 0
a_x = 0
t = ?
y = ?
---------------------------
used the horizontal motion formula to find t
x = x_0 + v_x0 t + 1/2a_x t^2
t = 35/23.7 = 1.5s
and then the vertical motion formula to find y with the time i found above
y = y_0 + v_y0 t - 1/2gt^2
y = -1/2 (9.8)(1.5^2)
y = 11.025m
---------------------------
they said that this answer is "not quite", but i went over my calculations and still got 11.025 m. did i plug in the wrong values or used the wrong formulas?
thanks!
so I'm pretty stumped on this one question from masteringphysics:
A ball thrown horizontally at 23.7 m/s from the roof of a building lands 35.0 m from the base of the building. How high is the building?
i first listed all of my given values
---------------------------
v_x0 = 23.7 m/s
a = a_y = -g = -9.8 m/s^2
x = 35 m
x_0 = y_0 = 0
v_y0 = 0
a_x = 0
t = ?
y = ?
---------------------------
used the horizontal motion formula to find t
x = x_0 + v_x0 t + 1/2a_x t^2
t = 35/23.7 = 1.5s
and then the vertical motion formula to find y with the time i found above
y = y_0 + v_y0 t - 1/2gt^2
y = -1/2 (9.8)(1.5^2)
y = 11.025m
---------------------------
they said that this answer is "not quite", but i went over my calculations and still got 11.025 m. did i plug in the wrong values or used the wrong formulas?
thanks!