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(II) A football is kicked at ground level with a spced of 18.0 $\mathrm{m} / \mathrm{s}$ at an angle of $38.0^{\circ}$ to the horizontal. How much later does it hit the ground?

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2.26 $\mathrm{s}$

Physics 101 Mechanics

Chapter 3

Kinematics in Two or Three Dimensions; Vectors

Motion Along a Straight Line

Motion in 2d or 3d

Newton's Laws of Motion

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

Lectures

02:34

In physics, a rigid body is an object that is not deformed by the stress of external forces. The term "rigid body" is used in the context of classical mechanics, where it refers to a body that has no degrees of freedom and is completely described by its position and the forces applied to it. A rigid body is a special case of a solid body, and is one type of spatial body. The term "rigid body" is also used in the context of continuum mechanics, where it refers to a solid body that is deformed by external forces, but does not change in volume. In continuum mechanics, a rigid body is a continuous body that has no internal degrees of freedom. The term "rigid body" is also used in the context of quantum mechanics, where it refers to a body that cannot be squeezed into a smaller volume without changing its shape.

02:21

In physics, rotational dynamics is the study of the kinematics and kinetics of rotational motion, the motion of rigid bodies, and the about axes of the body. It can be divided into the study of torque and the study of angular velocity.

02:33

(II) A football is kicked …

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A football is kicked at gr…

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A soccer ball is kicked wi…

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A football is punted with …

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02:00

In a football game a kicke…

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A placekicker must kick a …

01:36

A football player kicks a …

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A football is kicked from …

02:56

10:37

A place kicker must kick a…

so the football is being hit from ground level. We can say that v Y final equals B. Why initial plus 80. We're trying to find how much how much how long it takes for the, uh, ball to hit the ground again. So t would be equal to be. Why final minus v. Why initial divided by, uh in this case G and we can say that here the ball is going to fall with the the final velocity of the ball right before it hits the ground would be equal to the initial velocity of the ball. When it is hit, however, it would only be in the opposite direction. So here it would be a negative 18.0 times sign of 38 degrees to get the white component meters per second and then minus positive 18 0.0 sign of 38 degrees. Again, the units four meters per second and then this whole entire thing would be divided by negative 9.80 We're choosing upwards to be positive. So the acceleration due to gravity would be negative negative 9.80 meters per second squared, and we find that the time is going to be 2.26 seconds. This would be our final answer. That is the end of the solution. Thank you for watching.

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