Maximum Height Of A Projectile
TECTechnics Classroom   TECTechnics Overview

Maximum Height Of A Projectile

The parametrc equatons of the motion of a projectile are as follows:
x = 20t ------(1)
y = -16t2 + 30t -------(2)
(a) What is the maximum height of the projectile?
(b) What is the initial velocity of the projectile?
(c) What is the velocity of the projectile when it hits the ground?
(d) What is the range of the projectile?

The string:
(a) S7P4A42 (Motion - Parabolic).
(b) and (c) S7P5A51 (Physical Change - Velocity)
(d) S7P4A41 (Linear Motion)
The math:
Pj Problem of Interest (PPI) is of type motion. Problems of distance traveled are motion problems.
Vertical velocity of projectile, v = 30 - 32t ---------(3) (derivative of eqn(2))
The projectile attains its maximum height when its vertical velocity, v = 0.
v = 0, when t = 30/32 sec (from eqn(3))
substitute t = 30/32 in eqn (2) to get maximum height of projectile
So, maximum height = 30(30/32) - 16(30/32)2 = 14.1 ft
(b) Pj Problem Of Interest (PPI) is of type change. Speed, velocity, acceleration and t (duration) problems are change problems.
Initial velocity of projectile = 30 ft/sec
(c) Projectile hits the ground when y = 0.
When y = 0, t = 15/8 (from eqn (2)).
Subtituting t = 15/8 in equation (3), we have:
Velociy of projectile when it hits the ground = 30 - 32(15/8) = 30 - 60 = -30 ft/sec.
(d) Pj Problem Of Interest (PPI) is of type motion. Distances due to motion are motion problems.
The range of a projectile is the horizontal distance from the origin of the projectile to the point when the projectile hits the ground.
So, substituting t = 15/8 in equation (1), we have:
20t =20(15/8) = 75/2 = 37.5
So, range of projectile is 37.5 ft.

Math The Universe is composed of matter and radiant energy. Matter is any kind of mass-energy that moves with velocities less than the velocity of light. Radiant energy is any kind of mass-energy that moves with the velocity of light.
Periodic Table
Composition And Structure Of Matter
How Matter Gets Composed
How Matter Gets Composed (2)
Molecular Structure Of Matter
Molecular Shapes: Bond Length, Bond Angle
Molecular Shapes: Valence Shell Electron Pair Repulsion
Molecular Shapes: Orbital Hybridization
Molecular Shapes: Sigma Bonds Pi Bonds
Molecular Shapes: Non ABn Molecules
Molecular Orbital Theory
More Pj Problem Strings

Blessed are they that have not seen, and yet have believed. John 20:29

TECTechnic Logo, Kimberlee J. Benart | © 2000-2021 | All rights reserved | Founder and Site Programmer, Peter O. Sagay.