I need help with the following two problems in the attachment. How do I tell if velocity and acceleration are positive, negative or zero? Please see the attached file.

1) The next figure above shows the velocity vectors corresponding to the upward motion of the power ball. Indicate whether its velocity and acceleration, respectively, are positive (upward), negative, or zero.
Use P, N, and Z for positive (upward), negative, and zero, respectively. Separate the letters for velocity and acceleration with a comma.

2) Since the length of is directly proportional to the length of , the vector connecting each dot to the next could represent velocity vectors as well as position vectors, as shown in the figure above . Indicate whether the velocity and acceleration of the ball are, respectively, positive (upward), negative, or zero.
Use P, N, and Z for positive (upward), negative, and zero, respectively. Separate the letters for velocity and acceleration with a comma.

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Solution Summary

Solution attaches Word and PDF file alternatives which show how to you can tell if acceleration and velocity are positive, negative or zero for the given diagrams

... your line should be a diagonal from 0m/s at time 2 to 1 m/s at time 3. 3) Time 3 to time 4 seconds, acceleration is 0.5; velocity slope will be positive 0.5. ...

... When the velocity increases the acceleration is positive and so is the force. ... When the velocity increases the acceleration is positive and so is the force. ...

... Obviously, due to the constraints of the guide, the velocity and acceleration will be along the positive x-axis (in our case we define the positive direction ...

... 18. The particle moves along the x axis, the velocity should be positive. Then the particle's speed is increasing, then the acceleration is positive. ...

... (b) For the line with steeper positive slope we ... What is its acceleration? The initial velocity u, distance covered x, acceleration a and the time taken t for a ...

... the collision, the joined mass is moving with some velocity thus the ... the opposite direction (the elevator slows down), hence the acceleration is positive. ...

... is related to initial velocity and the acceleration as v ... the velocity is equal to the initial velocity plus the ... function a(t ) . The area has positive sign if ...

... The velocities are needed in the conservation equations ... 4. Assume now that the angular velocity of the ... tire accelerates with constant angular acceleration alpha ...

... Similar to 42, Assume the up direction is positive. The acceleration is down due to gravity ... 2 2 When the object reaches its maximum height, the velocity is zero ...