Please help with these three questions! Thank you! (No links! No trolls! Will mark brainliest!)

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Choose the more precise measurement. 26.4 cm or 8.39 cm

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.