# Calculus/physics problem?

So my calculus teacher decided to give us some physics problems and I have no what idea what I'm doing. Some answers would be nice and also explainations to go with them.
1. An object is dropped from a building 100 meters tall. When is the object halfway down the building? My answer is 3.19 seconds but I...
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So my calculus teacher decided to give us some physics problems and I have no what idea what I'm doing. Some answers would be nice and also explainations to go with them.

1. An object is dropped from a building 100 meters tall. When is the object halfway down the building? My answer is 3.19 seconds but I don't know if thats right.

2. Standing on the ground, I toss an object upward with a velocity of 15m/sec. When does it reach its highest point?

3.Standin gon a building 100 meters tall, I toss an object upward with a velocity of 15m/sec. What is its height after 3 seconds?

4.Standing on a building 100 meters tall, I toss an object upward with a velocity of 15m/sec. When does it hit the ground?

5.Standing on a building 100 meters tall, I toss an object downward with a velocity of 15m/sec. How fast is it going when it hits the ground?

1. An object is dropped from a building 100 meters tall. When is the object halfway down the building? My answer is 3.19 seconds but I don't know if thats right.

2. Standing on the ground, I toss an object upward with a velocity of 15m/sec. When does it reach its highest point?

3.Standin gon a building 100 meters tall, I toss an object upward with a velocity of 15m/sec. What is its height after 3 seconds?

4.Standing on a building 100 meters tall, I toss an object upward with a velocity of 15m/sec. When does it hit the ground?

5.Standing on a building 100 meters tall, I toss an object downward with a velocity of 15m/sec. How fast is it going when it hits the ground?

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