physics

posted by .

A high jumper wants to clear the bar at 2.1m. To do so he needs to raise his center of mass to a height of 2.4m. Assuming that air resistance can be neglected and his center of mass is 1.1m above the ground at take-off, determine the required vertical take-off speed.

  • physics -

    The jumper has to raise his center of
    mass to the height of 2.4, i.e. to move
    it by the distance of 2.4 -1.1 =1.3 m
    From kinematics
    h =Vo•t-g•t^2/2,
    0=Vo –gt
    Vo=sqrt(2•g•h) =sqrt (2•9.8•1.3) =5.05 m/s

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Phys 1200

    I am doing my HW and I have a few questions I don't understand. Each has their own answers but I have to find how they got it... #3 How much kinetic energy must an 80-kg high jumper generate to move his center of mass from 0.9m above …
  2. physics(help me with the angle)

    In the 1968 Olympic Games, University of Oregon jumper Dick Fosbury introduced a new technique of high jumping called the "Fosbury flop." It contributed to raising the world record by about 30 cm and is presently used by nearly every …
  3. physics(I'm taking a different way to solve)

    In the 1968 Olympic Games, University of Oregon jumper Dick Fosbury introduced a new technique of high jumping called the "Fosbury flop." It contributed to raising the world record by about 30 cm and is presently used by nearly every …
  4. Physics..Urgent!!!

    In the sport of pole vaulting, the jumper's point of mass concentration, called the centre of mass, must clear the pole. Assume that a 59 kg jumper must raise the centre of mass from 1.1 m off the ground to 4.6 m off the ground. What …
  5. Physics

    A high-jumper clears the bar and has a downward velocity of -6.00 m/s just before landing on an air mattress. The mass of the high-jumper is 50.4 kg. What is the magnitude and direction of the impulse that the air mattress exerts on …
  6. Physics(Please help)

    A high-jumper clears the bar and has a downward velocity of -6.00 m/s just before landing on an air mattress. The mass of the high-jumper is 53.7 kg. What is the magnitude and direction of the impulse that the air mattress exerts on …
  7. Physics

    On a frictionless table, a glob of clay of mass 0.54 kg strikes a bar of mass 1.24 kg perpendicularly at a point 0.27 m from the center of the bar and sticks to it. 1. If the bar is 1.02 m long and the clay is moving at 6.3 m/s before …
  8. physics

    A jumper of mass m=55 kg starts in a crouched position with the jumper's center of mass at a position y1=0 m. Just before the jumper leaves the floor, his or her center of mass is at y2=0.7 m. From another measurement, you have found …
  9. physics

    a high jumper approaches the takeoff point at a speed of 7.20 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the jumper can clear the bar.
  10. physics

    a uniform meter bar of mass 120kg is sup ported on two knife edges 30cm from its center, with a diagram calculate the reactions at these supports when a 160kg mass is suspended 20cm from the center of gravity of the bar towards the …

More Similar Questions