Aball is thrown with a speed of 20 m/s at an angle of 40°. which of the
following statements describes the motion of the ball at the top of its
trajectory?
a. the horizontal component of velocity is increasing
b. the vertical component of velocity is zero.
c. the vertical acceleration is zero

d. the horizontal component of velocity is zero

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?