A ball is projected upward at time t = 0.0 s, from a point on a ...

[WWatsford]

A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 36.2 m/s if air resistance is negligible.
 
  The time when the ball strikes the ground is closest to A) 9.4 s
  B) 9.0 s
  C) 8.7 s
  D) 9.7 s
  E) 10 s

Question 2

Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm3. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to
 
  A) 1:3.
  B) 4:3.
  C) 3:4.
  D) 1:4.
  E) 4:1.

[mariahkathleeen]

Answer to Question 1

A

Answer to Question 2

B

[WWatsford]

Thanks

[mariahkathleeen]

Welcome