Salmon often jump waterfalls to reach their breeding grounds.
Starting downstream, 3.18 m away from a
waterfall 0.294 m in height, at what minimum
speed must a salmon jumping at an angle of
45° leave the water to continue upstream?
The acceleration due to gravity is 9.81 m/s?.
Answer in units of m/s.

An uplifted block of rock between two normal faults

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.