what so you mean by acceleration?whan it is positive negative and zero.
Answers
Explanation:
When the velocity of an object increases, the acceleration is positive.In this case, the acceleration is in the direction of Velocity. ... Its directions is opposite to the direction of Velocity. ⚫ Zero Acceleration. If the velocity of the object does not change with time,it has zero acceleration.
Answer:
●Positive acceleration means acceleration in the direction of velocity ( it always increases the speed of particle).
●Negative acceleration means acceleration opposite to the direction of velocity ,it is also known as retardation (it always decreases the speed of the particle).
●Zero acceleration means body is not accelerating, in this case it's velocity is constant .The body moves in a straight line, it neither speed up or down nor change direction .
【 In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration. If there is no acceleration vector then it is called zero acceleration. 】
【 If dot product of acceleration vector and velocity vector is positive then positive acceleration and if dot product of acceleration vector and velocity vector is negative then acceleration is negative.
◆If dot product is zero then it will be either zero acceleration or angle between acceleration vector and velocity vector is 90° ( in this case acceleration is going on but here speed is not changing rather only direction of particle is changing)】
Explanation: