06.12.2013, 21:00
Can anyone give me a hand with this math problem?
A person at the top of an 40 m cliff throws a rock straight up into the air with an initial
velocity of 20 m/s. The height equation is h = -4.9t
2
+ 20t + 40
a) At what times is the height of the rock 55.0 m above the ground?
b) What is rock’s maximum height?
c) How many seconds after the rock is thrown does it hit the ground?
A person at the top of an 40 m cliff throws a rock straight up into the air with an initial
velocity of 20 m/s. The height equation is h = -4.9t
2
+ 20t + 40
a) At what times is the height of the rock 55.0 m above the ground?
b) What is rock’s maximum height?
c) How many seconds after the rock is thrown does it hit the ground?