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Movement in a specific direction is called __________.
gravity

velocity

speed

acceleration



What is equal to velocity change per second?
acceleration
scalar
frequency
speed


Sagot :

Answer 
Part 1: Velocity
Part 2: Acceleration

Explanation
Part 1
Velocity is a vector quantity. This means that velocity has both direction and magnitude. 
Velocity is defined as the change of distance with time in a specific direction. 

Part 2
When velocity of a particle is changing, then it can be said that the particle is accelerating. 
Change of velocity with time is called acceleration.