# Physics questions .

1. Feb 17, 2004

### hyen84

Physics questions.....

1.) From her bedroom window a girl drops a water-filled balloon to the ground, 5.53 m below. If the balloon is released from rest, how long is it in the air? ** they didn't give me any velocity, so i dunno waht to do **

2.) Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the initial speed of the first arrow is 25.6 m/s and that the second arrow is fired 2 s after the first. Determine the initial speed of the second arrow. ** ím lost on this one**

3.) A ball is dropped from rest from the top of a cliff that is 27.6 m high. From ground level, a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of the second ball is exactly the same as that with which the first ball eventually hits the ground. In the absence of air resistance, the motions of the balls are just the reverse of each other. Determine how far below the top of the cliff the balls cross paths. ** totally lost***

4.) The three-toed sloth is the slowest moving land mammal. Assume that on the ground the sloth moves at an average speed of 0.013 m/s, considerably slower than the giant tortoise, which walks at 0.0193 m/s. After 20 minutes of walking, how much further would the tortoise have gone relative to the sloth?

2. Feb 17, 2004

### Artman

$$v(t) = v_0 + \frac{1}{2} a t^2$$