Salmon, swimming up the Fraser river to their spawninggrounds, leap over all sor

Question

Salmon, swimming up the Fraser river to their spawninggrounds, leap over all sorts of obstacles. The unofficialsalmon-altitude record is an amazing 3.40 m jump. Assuming the fishtook off at 45.0°, what was its speed on emerging from thewater? Ignore friction.
5.77 DIDNT WORK IM SOO LOST Salmon, swimming up the Fraser river to their spawninggrounds, leap over all sorts of obstacles. The unofficialsalmon-altitude record is an amazing 3.40 m jump. Assuming the fishtook off at 45.0°, what was its speed on emerging from thewater? Ignore friction.
5.77 DIDNT WORK IM SOO LOST

Explanation / Answer

vy^2 = voy^2+ 2*a*y vy = final velocity = 0 at the height ofhis jump voy = initial y velocity = unknown a = acceleration = gravity = -9.8 m/s^2 y = 3.40m 0 = voy^2 + 2*(-9.8 m/s^2)*3.40m subtract voy^2 from both sides, andsimplify: -voy^2 = -66.64 m^2/s^2 multiply by -1 and take the square root of bothsides voy = 8.16 m/s then to get vo we divide by cos 45degrees vo = 11.54 ms

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