Physics Question!!?

Please tell me the answer to these questions and explain how u got the answer. Thanks!

1. When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

a) 0.5v b) v c) 1.4v d) 2v e) 4v

2. A tin can topples from a balcony ledge that is at height h above the ground and its the sidewalk with velocity v. How high would the balcony have to be in order for the can to hit the ground with velocity 2v?

a) 2h b) 4h c) 4h d) 5h e) 6h