Question #22e22

Question

3291 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-06-25T15:02:45

$h = y_{i} + v_{i} \cdot t \cdot sin α - \frac{1}{2} \cdot g \cdot t^{2}$ $h=y_i+v_i*t*sin alpha-1/2*g*t^2$

$y_{i} : height of building$ $y_i:"height of building"$

$v_{i} = initial velocity$ $v_i="initial velocity"$

$α = angle$ $alpha="angle"$

$sin 25 = 0.423$ $sin 25=0.423$

$t : time$ $t:"time"$

$g : 9.81 \frac{m}{s^{2}}$ $g:9.81" "m/s^2$

$0 = y_{i} + 15 \cdot 3 \cdot 0.423 - \frac{1}{2} \cdot 9.81 \cdot 3^{2}$ $0=y_i+15*3*0.423-1/2*9.81*3^2$

$we have written h=0 because object has fallen$ $"we have written h=0 because object has fallen"$

$0 = y_{i} + 19.035 - 44.145$ $0=y_i+19.035-44.145$

$0 = y_{i} - 25.11$ $0=y_i-25.11$

$y_{i} = 25.11 m$ $y_i=25.11 " "m$