can the velocity of an object be negative when its acceleration is positive?what abaout vise versa?

Answer 1

I deem it can.
Velocity is a vector quantity and the sign of negative simply means the object is moving in a opposite direction.
Acceleration can definitely be either positive or negative in this case. It depends on the change of velocity of the body. A positive acceleration shows that the body is experiencing an increase in its velocity. A negative acceleration indicates that the body is slowing down or so called retardation or deceleration. It does so vice versa.

Answer 2

depends what the magnitude of the velocity vector and acceleration are.
v^2 = v.^2 + 2ax
Let v. = initial velocity and v be the final velocity a be the acceleration and x being the distance traveled. For the sake of relativity, let's assume the initial velocity is zero. According to the equation, if the velocity is negative, the acceleration has to be positive since its solution is a squared term (can't have the square root of a negative).

Velocity CAN be positive and acceleration be negative in the situation where the acceleration is negative and also the distance traveled x is negative as well.

So the latter is true but the former is false.

Answer 3

Both velocity and acceleration are vector quantities, that is they have a magnitude, which is always positive, and a direction. Once you define a positive direction, for example moving to your right, then there is a negative direction, to your left. People will say -v when what the mean is v going in the negative direction, or a rocket has an acceleration up (a) due to its engines, but experiences a acceleration of - g (down) due to gravity. The net force on the rocket is F=m(a-g)

Answer 4

Consider an object thrown up into the air, specifically the portion of the motion for which the object is moving up. If the positive direction is down, the acceleration is positive and the velocity is negative. If the positive direction is up, the acceleration is negative and the velocity is positive. Therefore, both scenarios are possible.

Answer 5

Can Velocity Be Negative

Answer 6

I believe so. An object with negative velocity is moving "backwards", but a positive acceleration means it is slowing down. Eventually it will stop and slowly start moving forwards, faster and faster. In other words, the negative velocity "increased" to zero, and then to an increasing positive number.

Answer 7

Either case is possible. In fact, that is exactly how oscillation occurs. In sinusoidal oscillatory motion (like a pendulum), acceleration and velocity are 90 deg out of phase

Maximum positive and negative acceleration coincide with 0 velocity, and maximum positive and negative velocity coincide with 0 acceleration.

Answer 8

negative and positive velocity depends on direction of velocity
if it is in positive direction then positive if in negative then negative

Answer 9

As acceleration is change in velocity, so if the velocity is decreasing i.e. velocity is negtaive

Answer 10

yes