A ball is thrown vertically upward from a point 80 ft above the ground with an initial velocity of 64 ft/sec. (a) Find how fast is the ball moving when it is 128 ft above the ground. (b) Find the time it would take the ball to reach the maximum height. (c) Find the velocity of the ball before it hits the ground.

A ball is thrown vertically upward from a point 80 ft above the ground with an initial velocity of 64 ft/sec. (a) Find how fast is the ball moving when it is 128 ft above the ground. (b) Find the time it would take the ball to reach the maximum height. (c) Find the velocity of the ball before it hits the ground.

Classical Dynamics of Particles and Systems

5th Edition

ISBN:9780534408961

Author:Stephen T. Thornton, Jerry B. Marion

Publisher:Stephen T. Thornton, Jerry B. Marion

Chapter2: Newtonian Mechanics-single Particle

Section: Chapter Questions

Problem 2.6P: In the blizzard of ’88, a rancher was forced to drop hay bales from an airplane to feed her cattle....

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

A ball is thrown vertically upward from a point 80 ft
above the ground with an initial velocity of 64 ft/sec.
(a) Find how fast is the ball moving when it is 128 ft
above the ground. (b) Find the time it would take the
ball to reach the maximum height. (c) Find the
velocity of the ball before it hits the ground.

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