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physics

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In a scene in an action movie, a stunt man
jumps from the top of one building to the
top of another building 4.9 m away. After a
running start, he leaps at an angle of 17

with
respect to the flat roof while traveling at a
speed of 5.8 m/s.
The acceleration of gravity is 9
.
81 m
/
s
2
.
To determine if he will make it to the other
roof, which is 1.4 m shorter than the build-
ing from which he jumps, find his vertical
displacement upon reaching the front edge of
the lower building with respect to the taller
building.
Answer in units of m

  • physics - ,

    Vo = 5.8m/s[17o]
    Xo = 5.8*cos17 = 5.55 m/s.
    Yo = 5.8*sin17 = 1.70 m/s.

    Y = Yo + g*t = 0 @ max. ht.
    Tr = (Y-Yo)/g = (0-1.70)/-9.8 = 0.173 s.
    = Rise time.

    h=(Y^2-Yo^2)/2g = (0-1.7^2)/-19.6=0.147 m.

    h = 1.4 + 0.147 = 1.55 m Above shorter
    bldg.

    h = 0.5g*t^2 = 1.55 m.
    4.9*t^2 = 1.55
    t^2 = 0.316
    Tf = 0.562 s. = Fall time or time to fall to roof of shorter bldg.

    Dx = Xo * (Tr+Tf)
    Dx = 5.55m/s * (0.173+0.562) = 4.08 m.
    = His Hor. distance from bldg. #1.
    Therefore, he will fall short of bldg. #2:
    4.9 - 4.08 = 0.82 m. Short.

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