Mythreyan, a baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 70.0
from the horizontal with a velocity of 55.0 m/s.

b. How far will it travel in the air?
c. What is its maximum height?
d. How much time does it spend in the air?

The radioactive isotope of lead, pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 80% of the lead to decay? (round your answer to two decimal places.)