Physics

posted by .

A rock is ejected vertically upward at 40 m/s. At what time is the rock moving at 20 m/s upward.

  • Physics -

    v = Vi - g t
    20 = 40 - 9.81 t
    9.81 t = 20
    t = 20/9.81

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go?
  2. physics

    A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go?
  3. physics

    A small rock is thrown vertically upward with a speed of 13.0 from the edge of the roof of a 31.0 tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected …
  4. class

    WHAT DOES A 138 N ROCK WEIH IF IT IS ACCELERATING UPWARD AT 12 M/S DOWNWARD AT3.5 M/S . C WHAT WOULD BE THE ANSWERS TO PARTS (A)AND (B) IF THE ROCK HAD A MASS OF138 Kg WHAT WOULD BE THE ANSWERS TO PARTS A AND B IF THE ROCK WERE MOVING …
  5. physics

    c) A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff the rock has the speed of 29 m/s. Assuming that the air resistance can be ignored, find i. the …
  6. physics

    A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward?
  7. Physics

    A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 32.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. …
  8. Physics

    A small rock is thrown vertically upward with a speed of 14.0m/s from the edge of the roof of a 25.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. …
  9. physics

    A rock is given a KE of 2.00*10^4 J when it is launched vertically upward. If the rock reaches a height of 50m determine the mass of the rock.
  10. physics

    A rock is shot up vertically upward from the edge of the top of the building. The rock reaches its maximum height 2 s after being shot. Them, after barely missing the edge of the building as it falls downward, the rock strikes the …

More Similar Questions