Physics
posted by Vickie
The position of a particle in meters is given by x =3.6t2  2.4t3 , where t is time in seconds.
A) Find the two times when the velocity is zero.
B) Calculate the position for each of those times.

drwls
V = dx/dt = 7.2 t  7.2 t^2
= 7.2t*(1t)
A) V = 0 when t = 0 and t = 1 s
B) Susbtitute those times in the x(t) equation.
Respond to this Question
Similar Questions

Physics
(a) If the position of a particle is given by x = 16t  7t3, where t is in seconds and x is in meters, when is the particle's velocity zero? 
calculus
a particle moves along a number line measured in cm so that its position at time t sec is given by s=72/(t+2) +k, k is a constant and t>=0 seconds. (a) Find the instantaneous velocity of the particle at t=4 seconds (b) Find the … 
physics
The position vector r of a particle moving in the xy plane is r=2ti+2sin[(pi/4)t]j , with is in meters and t in seconds. (a) Calculate the x and y components of the particle's position at , and 4.0 s and sketch the particle's path … 
physics
If the position of a particle is given by x = 35t  7t^3, where x is in meters and t is in seconds, answer the following questions. (a) When, if ever, is the particle's velocity zero? 
Physics
A single force acts on a 1.1 kg particlelike object in such a way that the position of the object as a function of time is given by x = 4.1t  3.6t2 + 4.5t3, with x in meters and t in seconds. Find the work done on the object by the … 
Physics
A particle is moving along a straight line and its position is given by the relation x=( t36t215t+40)mm. Find: (a). The time at which velocity is zero. (b). Position & displacement of the particle at that point. (c). Acceleration … 
Calculus
Sorry this is really long. Just wondering how I would do each of these A particle is moving with velocity v(t) = t^2 – 9t + 18 with distance, s measured in meters, left or right of zero, and t measured in seconds, with t between … 
physics
A particle is moving along a straight line and its position is given by the relation x=( t36t215t+40)mm. Find: (a). The time at which velocity is zero. (b). Position & displacement of the particle at that point. (c). Acceleration … 
physics
A particle is moving along a straight line and its position is given by the relation x=(t3 6t2 15t+40) m FIND a) The time at which velocity is Zero, b) Position and displacement of the particle at that point. c) Acceleration for … 
Calculus
1) A particle is moving along the xaxis so that its position at t ≥ 0 is given by s(t) = (t)In(2t). Find the acceleration of the particle when the velocity is first zero. 2) The driver of a car traveling at 50 ft/sec suddenly applies …