2 questions of velocity and time class 9

The figure shows the velocity versus time curve for a car traveling along a straight line.Which of the following statements is false?

An object is thrown vertically into the air.  Which of the following five graphs represents the velocity (v) of the object as a function of the time (t)?  The positive direction is taken to be upward.

: A racing car starts from rest at t = 0 and reachesa final speed v at time t. If the acceleration of the car isconstant during this time, which of the following statementsare true?(a) The car travels a distance vt.(b) The average speed of the car is v/2.(c) The magnitude of the acceleration of the car is v/t.(d) The velocity of the car remains constant.(e) None of statements (a) through (d) is true.Q12: When applying the equations of kinematics for an ob-ject moving in one dimension, which of the following state-ments must be true?(a) The velocity of the object must remain constant.(b) The acceleration of the object must remain constant.(c) The velocity of the object must increase with time.6

Dierentiate between speed and velocity.

Consider a particle travelling along the path given by c(t) = (−t, t, t^2). Here t denotes time. (a) Find the velocity and the speed of the particle.