v = 53-9.8t
so find when v = ±40
A rock is thrown straight up into the air with an initial speed of 53 m/s at time
t = 0.
Ignore air resistance in this problem. At what times does it move with a speed of 40 m/s? Note: There are two answers to this problem.
earlier time:
later time:
1 answer
1 answer