# math

posted by .

Which three options are true about motion in a straight line.

A. A particle which moves at an increasing velocity has a constant acceleration.

B. If two particles always have the same velocity as each other, their separation does not change.

C. A particle which has zero acceleration moves with constant velocity or is stationary.

D. A particle with negative position must have had a negative acceleration in the past.

E. The acceleration of any subject is 9.8m s^-2

F. A particle which moves with a constant acceleration also has a constant velocity.

G. An object which is dropped and falls only under gravity accelerates downwards at approximately 9.8m s^-2

H. Velocity is the magnitude of the speed.

I think A, B and G. Can anyone help?

## Similar Questions

1. ### maths

Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does not …
2. ### math

Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does not …
3. ### Chels

What can you say about the motion of a body if its veloctiy-time graph is a straight line inclined with the time axis?
4. ### math

What is true for motion in a straight line. A. if a vechile has zero velocity , it must be stationary. B.the graph of position against time has to be a straight line. C.acceleration is the rate of change of speed. D.velocity is the …
5. ### math(mechanics)

the acceleration of a particle as it moves along a straight line is given by a=(2t-1)m/s^2, where t is in seconds.if s=1m and v= 2m/s when t=0,determine the particles velocity and position when t=6s. Also, determine the total distance …
6. ### Physics true false

true false The speed of a particle is always positive. True False The average speed of a particle is equal to the magnitude of its average velocity. True False The acceleration of a particle can be non-zero when its speed is constant. …
7. ### physics

A body starts with an initial velocity of 10m/s and moves along a straight line with a constant acceleration. When the velocity of the particle becomes 50 m/s the acceleration is reversed in direction without changing magnitude. Find …
8. ### physics

a particle with velocity of 2m/s at t= 0 moves along a straight line with constant acceleration of 0.2m/s2. find the displacement of the particle in 10 seconds
9. ### Physics

Pease evaluate the statements by choosing from these three statements Always true: the statement is true under any circumstances Not necessarily true: the statement may be true in some circumstances, but not in others Always false: …
10. ### Physics

1. Which statement below is true? a. If a car is traveling eastward, its acceleration is eastward. b. If a car's speed is decreasing, its acceleration must be negative. c. If a particle is moving, it must have a non-zero acceleration.

More Similar Questions