A boy jumps from a wall 3m high. What is an estimate of the change in momentum of the boy when he lands without rebounding?
the answer is 5x10^2kg/ms, but how?

  1. 👍
  2. 👎
  3. 👁
  1. what's his mass?

    momentum is ... m * v

    his velocity is ... √(2gh) = √(2 * 9.8 * 3)

    1. 👍
    2. 👎
  2. it didn't say:(

    1. 👍
    2. 👎
  3. so the question is "estimating" his mass to be about 65 kg (143 lbs)
    ... a reasonable number

    but a very poor question

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    a ladder 6 meters long leans against a wall. It rests on the ground 1 meter away from the wall. How high on the wall does the ladder rest?

  2. Physics

    A racquet ball with mass m = 0.238 kg is moving toward the wall at v = 12.5 m/s and at an angle of θ = 31° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and

  3. math

    A playground is on the flat roof of a city school, 5.8 m above the street below (see figure). The vertical wall of the building is h = 7.30 m high, to form a 1.5-m-high railing around the playground. A ball has fallen to the

  4. Physics

    a boy stands at a distance of 175 m from a high wall. He claps his hands and hears an echo after one second. Calculate the speed of sound in air.

  1. Calculus

    related rates: a ladder, 12 feet long, is leaning against a wall. if the foot of the ladder slides away from the wall along level ground,what is the rate of change of the top of the ladder with respect to the distance of the foot

  2. biomechanics

    in a vertical jump and reach test, a 60 kg student jumps 60 cm, while 90 kg student jumps 45 cm. Assuming both jumps took the same amount of time, which jumper was more powerful?

  3. Statistics

    A researcher wishes to estimate the proportion of adults who have high-spped internet access. What size sample should be obtained if she wishes the estimate to be within .02 with 90% if A) She uses a previous estimate of 0.48? B)

  4. Math Someone plz plz plz help!!!

    Jorge plans to paint a bedroom wall that is shaped like a trapezoid. The bottom edge of the wall is 22.5 feet long, and the top edge of the wall is 9.5 feet long. If the wall is 8 feet tall, what is the area of the wall? • 256

  1. Physics

    An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If

  2. Math

    A ladder is placed against a wall, with its base 2 m from the wall. The ladder touches the top of a 2 m fence that is 1.5 m from the wall. How high up the wall does the ladder reach? Thanks for answering! Your help is greatly

  3. algebra 2

    A skier has decided that on each trip down a slope, she will do 2 more jumps than before. On her first trip she did 6 jumps. Derive the sigma notation that shows how many total jumps she attempts from her fourth trip down the hill

  4. maths

    A ladder 6m long is placed against a vertical wall,its lower end is 2m away from the wall. How high up the wall does it reach?give your answer in one decimal place.

You can view more similar questions or ask a new question.