Homework Help: algebra

Posted by sarah on Monday, August 22, 2011 at 5:14pm.

i was wondering if i did this right
A cannon ball is shot from a cannon on top of a hill that is 73.5 meters above sea level. The cannon ball leaves the cannon with a velocity of 9.8 m/s. Write and solve a quadratic equation to determine when the cannon ball will reach sea level.

0 = -4.9t² + 9.8t + 73.5
0 = -4.9(t² - 2t - 15)
0 = -4.9(t - 5)(t + 3)
t - 5 = 0 and t + 3 = 0
t = {5,-3}

t = 5 since t = -3 is not acceptable negative value.

Hence, the cannon ball will reach sea level at 5 seconds.

algebra - bobpursley, Monday, August 22, 2011 at 5:16pm
yes, assuming it was shot horizontally.

Answer this Question

Related Questions

AP Physics - Momentum One of those Civil War cannons is fired. The Cannon has a ...
Physics - A cannon of mass 200kg, fires a cannonball with a mass of 10kg. The ...
Physics - A 500 kg cannon rests on wheels that are free to roll. The cannon ...
AP Physics - 22. a)You are a pirate working for Dread Pirate Roberts. You are in...
Physics - Part 1 You are a pirate working for Dread Pirate Roberts. You are in ...
Physics - Part 1 You are a pirate working for Dread Pirate Roberts. You are in ...
physics - Part 2 You are a pirate working for Dread Pirate Roberts. You are in ...
Physics - a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52....
Physics - a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52....
science - how much does gravity affects my cannon shot?

For Further Reading

First Name:
School Subject:
Answer: