A ball is shot vertically into the air at a velocity of 60 m/sec. After 4 sec., another ball is shot vertically into the air. (a) Determine the time in sec. that the first ball has traveled to meet the second ball 120 m, from the ground. (b) Determine the time in sec. that the second ball has traveled to meet the first ball 120 m. from the ground. (c) What initial velocity in m/s must the second ball have to meet the first ball 120

A ball is shot vertically into the air at a velocity of 60 m/sec. After 4 sec., another ball is shot vertically into the air. (a) Determine the time in sec. that the first ball has traveled to meet the second ball 120 m, from the ground. (b) Determine the time in sec. that the second ball has traveled to meet the first ball 120 m. from the ground. (c) What initial velocity in m/s must the second ball have to meet the first ball 120

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.

Question

A ball is shot vertically into the air at a velocity of 60 m/sec. After 4 sec., another ball is shot vertically
into the air. (a) Determine the time in sec. that the first ball has traveled to meet the second ball 120 m,
from the ground. (b) Determine the time in sec. that the second ball has traveled to meet the first ball
120 m. from the ground. (c) What initial velocity in m/s must the second ball have to meet the first ball
120 m. from the ground?

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