# College Physics

The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s.

(a) What is the velocity of the body at x = 4.0 m?
(b) At what positive value of x will the body have a velocity of 5.0 m/s?

I solved for work by using the changes in kinetic energy and got -75 J but don't see how that helps whatsoever.

1. 👍 0
2. 👎 0
3. 👁 1,020
1. F = ma. They gave you Force and mass, solve for acceleration. You can use the values of X they give you, the velocities, and the acceleration to solve for Vf and the X value where v = 5.0

1. 👍 0
2. 👎 0
2. Yes I know of using that equation but the acceleration is not constant so I can't just plug in into an equation with a different x value.

1. 👍 0
2. 👎 0
3. truth.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?

asked by Emily on January 25, 2012
2. ### Physics

A large crate filled with physics laboratory equipment must be moved up an incline onto a truck. 1. The crate is at rest on the incline. What can you say about the force of friction acting on the crate? a. The friction force point

asked by Nicole on September 22, 2008
3. ### physics

An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a positive magnitude of 6.7N; a second force has a magnitude of 4.6 N and points in the

asked by john on October 24, 2008
4. ### PHYSICS

The only force acting on a 2.3 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. At what positive value of x will the body have a

asked by Anonymous on October 21, 2011
5. ### physics

If the 1 kg standard body has an acceleration of 2.00 m/s2 at 20.0° to the positive direction of an x axis, what are (a) the x component and (b) the y component of the net force acting on the body, and (c) what is the net force

asked by Anonymous on February 12, 2010
1. ### Physic, maths, chemistry, biology

A body of mass 0.1kg is moving on circular path of diameter 1m at the rate of 10 revolution per 31.4sec, then then centripetal force acting on body is A) 0.2N B) 0.4N C)2N D) 4N

asked by Sahil on November 12, 2017
2. ### Physics

Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves

asked by Jill on June 30, 2013
3. ### Physics

A testing laboratory wants to determine if a new widget can withstand large acceleration and decelerations. To find out, they glue a 5.0kg widget to a test stand that will drive it vertically up and down. At 0 seconds the widget

asked by Sam on October 1, 2008
4. ### Geometry

A body of mass 15kg is placed on a smooth plane which is inclined at 60° to the horizontal. Find: a)the acceleration of the body as it moves down the plane b)the velocity that the body attains after 5s if: (i)it starts from rest

asked by Megan on May 23, 2020
5. ### physics

Four forces are acting on an object in static equilibrium: Force 1 has a magnitude of 46.0 N and is acting at an angle of (54) degrees above the positive x-axis. Force 2 has a magnitude of (42) N and is acting along the positive

asked by dalia on February 8, 2017