Salmon often jump waterfalls to reach their breeding grounds. Starting downstream, 1.99 m away from a waterfall 0.354 m in height, at what minimum speed must a salmon jumping at an angle of 38.4◦ leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s^2 . Answer in units of m/s.

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.