In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?

Answer 1

L=vₒ²•sin2α/g= vₒ²•2sinα•cosα/g
h= vₒ²•sin²α/2g,
L/h= 2•vₒ²•2sinα•cosα•g/ vₒ²•sin²α• g=
=4/tanα
tanα = 4h/L = 4•1.6/2=3.2
α=74⁰
vₒ=sqrt{2gh/sin²α }= ...

Answer 2

4.5