Only question 7. I keep getting it wrong and i’m not sure

I think you just have to input the horizontal velocity component.

Explanation:

Assuming no air resistance

The horizontal velocity is constant at

vx = 17.5cos71 = 5.6974... = 5.70 i m/s

The vertical velocity varies with gravity

vy = 17.5sin71 + -9.81(22) = -199.273... = -199 j m/s

v = 5.70i - 199j m/s

arguably one should round to only two significant digits

c.is a substance that requires a small amount of energy per gram to raise its temperature; has strong cohesive forces between molecules.

explanation:

a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

powerful computers now, not then