Physics, conceptual problems? HELP?
A truck full of corn is parked at x = 0 and is pointed in the negative direction. If the driver puts it into reverse and holds down on the accelerator, will the following quantities be positive, zero, or negative after one second? (a) position, (b) velocity, (c) acceleration.
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Verified answer
all positive
only the position is positive out of these.
a) If the truck is facing the negative direction and starts to back up, they are moving in the positive direction.
b) The truck is starting from rest and is accelerating backwards. This means that the truck will have a negative velocity after one second because it is moving in the opposite direction than where it is facing.
c) The acceleration is away from the direction that the truck is facing. So, it must be negative.