- #1
404
- 52
- 0
A projectile is launched with an initial speed of 60.0 m/s at an angle of 30 degrees above the horizontal. It lands on a hillside 4 sec later. Neglect air friction, what is the straight line distance from where the projectile was launched to where it hits the target?
I thought that was surprisingly easy, just use (sin30)*60*4, but I ended up with 207.84m, but the answer book said it was 212m? What did I do wrong?
A soccer player kicks a rock horizontally off a 40.0m high cliff into a pool of water. If the player hears a splash 3 sec later, what is the initial speed given to the rock? Assume speed of sound in air to be 343m/s
I figured out the vertical component of the initial speed to be 28 m/s, but how can you get the horizontal? I think you may be able to get the horizontal distance with the speed of sound?