If you are asking for the probability of getting a certain card you have a 1/ 20th chance
If you are asking for a percentage there is a 5% chance of getting any card
The rock's height is increasing in the interval from 0 seconds to 3 seconds.
At time 0 the rock starts moving upward from 52 foot until it reachs 180 foot height (time 3 seconds). Then the rock starts to descend, which means that the height starts to decrease.
