physics

posted by .

A ball is dropped from 1.5m and bounces back up 1.2m. How many times will the ball bounce before it loses 90% of its energy? I figued since the ball bouced .8 times the original hight and 10% of 1.5m is .15m that that when the bounce hight reached.15m that 90% of the energy (hight *gravity) was lost. Istarted with 1.5m times .8, then the result * .8 , and so on. 10 times results in a bounce hight of .16. Is this a correct approach?

  • physics -

    .8^n = .1
    n ln .8 = ln .1

    n = 10.31

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. calculus

    A ball has bounce coefficient 0 < r < 1 if when it is dropped from height h, it bounces back to a height of rh. Suppose that such a ball is dropped from an initial height a and subsequently bounces infinitely may times. Find …
  2. 6th grade

    each time a ball bounces it returns to a height 2/3 the hight of the previous bounce. after the third bounce, the ball returns to a hight of 4ft. from what height was it dropped
  3. physics

    A ball is dropped from 1.5 m and rebounds to 1.2m. How many times will it bounce before losing 90% of it's energy?
  4. physics

    a superball of mass .125 kg is dropped onto a concrete floor from a height of 1m it bounces back at a height of .9m. What is the net force acting on the ball before and after its released?
  5. Physics

    A rubber ball dropped from a height of exactly 5 ft bounces (hits the floor) several times, losing 10% of its kinetic energy each bounce. After how many bounces will the ball subsequently not rise above 2 ft?
  6. Math

    a special rubber ball is dropped from the top of a wall that is 64 feet high. each time the ball bounces it rises half as high as the distance it fell. The ball is caught when it bounces 1foot high. how many times did the ball bounce?
  7. physics

    A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is …
  8. physics

    A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is …
  9. physic

    A rubber ball dropped from a height of exactly 6 ft bounces several times on the floor, loosing 10% of its kinetic energy each bounce. After how many bounces will the ball subsequently not rise above 3 ft
  10. Physics

    2. Consider the ball example in the introduction when a ball is dropped from 3 meters. After the ball bounces, it raises to a height of 2 meters. The mass of the ball is 0.5 kg a. What is the speed of the ball right before the bounce?

More Similar Questions