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 F and D and H are true . is this correct???
You are so wrong, all three are wrong.
What about B, c, and G
well thanks for your help!
I apologize for the confusion earlier, but I can certainly help clarify the correct options for you.
Option B is true: If two particles always have the same velocity as each other, their separation does not change. This is because velocity is a measure of the rate at which an object changes its position, so if two particles have the same velocity, they will remain at the same distance from each other over time.
Option C is also true: A particle which has zero acceleration moves with constant velocity or is stationary. Acceleration is the rate at which velocity changes, so if the acceleration is zero, the velocity remains constant. This means the particle either continues moving with a constant velocity or remains stationary.
Option G is true: An object which is dropped and falls only under gravity accelerates downwards at approximately 9.8 m/s^2. This acceleration is known as the acceleration due to gravity and is constant near the Earth's surface. This means that an object falling freely under gravity will increase its velocity by 9.8 m/s^2 every second.
So the correct options are B, C, and G.