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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

An outfielder throws a 0.150-kg baseball at a speed of 40.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the hall at the highest point of its motion?

To determine
The kinetic energy of the ball at the highest point.

Explanation

Given Info:

The mass of the baseball is 0.150kg .

The speed of the ball is 40.0m/s .

The initial angle is 30.0° .

In the motion of base ball, at the highest point of its motion; the horizontal velocity of the ball will be zero.

The vertical velocity of the ball at the highest point of its motion is,

vx=v0cosθ

  • v0 is the initial velocity of the baseball

Therefore, the total velocity of the baseball at the highest point of its motion is,

v=vx+vy=v0cosθ

  • vx is the vertical velocity
  • vy is the horizontal velocity

Formula to calculate the kinetic energy of the ball is,

KE=12mv2

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