Homework Help: college physics

Posted by Thomas on Tuesday, August 24, 2010 at 3:30am.

Each of four particles moves along an x-axis. Their coordinates (in meters) as functions of time (in seconds) are given by:

Particle #1: x(t)=2t^2-4

Particle #2: x(t)= -3t-4

Particle #3: -2t^2-4

Particle #4: 2 *[sq. root (t+1)] -4

Which of these particles are speeding up for 0<t< infinity?

a)#1 only
b)#1,3,4
c)all four
d)none
e)#1,4

college physics - drwls, Tuesday, August 24, 2010 at 10:31am
If you consider "speeding up" to be an increase in speed, regardless of direction, then none of the choices is correct.
#2 and #3 accelerate, backwards. The others start out by slowing down.

They may be referring to increasing speed as an increase in V in the positive direction.

Answer this Question

Related Questions

Calculus (Derivatives) - Two particles are moving in straight lines. The ...
College Physics - four particles are fixed along an x axis, separated by ...
Physics - A person on horseback moves according to the velocity-versus-time ...
physics - An unstable nucleus of mass 17x10^-27 kg, initially at rest, ...
physics - A golf ball is hit off a tee at the edge of a cliff. Its x and y ...
Physics - Four particles in the xy plane have the following masses and ...
Physics 203 ( College) - Four particles, one at each of the four corners of a ...
physics - A 0.150 kg particle moves along an x axis according to x(t) = -13.00...
physics - A 0.150 kg particle moves along an x axis according to x(t) = -13.00...
physics - A particle moves along the x-axis according to the equation x = 50.0t...

For Further Reading

First Name:
School Subject:
Answer: