The final velocity would be greater. It wouldn't matter in which direction the truck was initially moving.
What is Velocity?
When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt),
represented by the equation v = Δs/Δt.
The SI Unit for velocity is meters per second (meter/second).
The different types of velocities are
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