Physics

posted by .

1.You are stuck on a cliff and want to know how far to the bottom. You drop a rock and time how long it takes to hit the ground. If the rock takes 10 seconds to hit the ground how high is the cliff? How fast was the rock going to impact?
2. You throw a plate off your roof with a speed of 10.0 m/ s. 4 seconds later it hits the ground? How far?
3. You throw a baseball straight up at 40 m/ s and it reaches its peak after 4 seconds. What is its speed when it falls back into your hand? What is it displacement? What distance has it traveled?

  • Physics -

    hf=hi+vi*t+1/2 gt^2

    g=-9.8m/s^2

    in the first, hf=0,hi=?, vi=0
    in the second, vi=-10,hf=0, hi=?

    in the third, the velocity at the top is zero.

    Vf=vi+gt
    vf=40-9.8(8)
    displacement =0 if it returns to your hand.

    distance? twich the height..
    hf=hi+40*t+1/2 g t^2 g=-9.8m/s^2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Two rocks are thrown off the edge of a cliff that is 15.0 m above the ground. The first rock is thrown upward, at a velocity of +12.0 m/s. The second is thrown downward, at a velocity of −12.0 m/s. Ignore air resistance. Determine …
  2. Physics

    A rock is thrown from on a cliff with the velocity of 15 m/s at an angle of 30 degrees. it takes the rock 6.30 seconds to hit the ground. how high was the cliff?
  3. Physics

    A rock is thrown from on a cliff with the velocity of 15 m/s at an angle of 30 degrees. it takes the rock 6.30 seconds to hit the ground. how high was the cliff?
  4. physics

    a rock is thrown of a cliff with an horizontal velocity of 55.0 m/sec. it takes the rock 7.0 sec to hit the ground a) what is the height of the cliff. b)how far from the foot of the cliff does the rock hit the ground. c) what is the …
  5. PHYSICS

    A ROCK IS THROWN OFF A CLIFF WITH AN HORIZONTAL VELOCITY OF 55.0 M/SEC. IT TAKES THE ROCK 7.0 SEC TO HIT THE GROUND A)WHAT IS THE HEIGHT OF THE CLIFF B) HOW FAR FROM THE FOOT OF THE CLIFF DOES THE ROCK HIT THE GROUND C)WHAT IS THE …
  6. pre calc

    A rock is dropped form the top of a cliff. It takes 12 seconds to hit the ground. What is the height in feet of the cliff?
  7. Physics

    A rock is thrown vertically from the edge of a cliff that is 500 ft high. It takes 6.5 seconds for the rock to hit the ground at the base of the cliff. Assume air resistance is negligible. (a) What was the initial velocity (magnitude …
  8. physics 1

    An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. …
  9. Physics

    An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. …
  10. PHYSICS

    looking over the edge of a cliff, you become curious as to how high up you are. you take a rock and drop it over the edge and count. The rock strikes the ground in between 3 and 4 of your count. so let's estimate that it took 3.5s …

More Similar Questions