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1. When S-T graph is parallel to x-axis the body is said to be at rest since the slope of S-T is zero.
2. Slope of velocity time graph give acceleration of a body in that particular direction.
When graph is straight line then its acceleration is constant and when the straight line is parallel to x-axis then its acceleration is zero.
Graph parallel to y-axis is not possible.
So for variable acceleration graph will be curved in shape.
so ans will be curved line
3. Slope of velocity time graph gives acceleration. If body moves with constant velocity then acceleration will be zero. So slope of v-t graph will be zero.
4. It will be straight line where y axis represent displacement
5. vector quantity
6. false because speed remains constant...velocity do not remain constant ...since the direction keeps on changing
7. True as Uniform motion is where we acceleration or deceleration is constant. But in crowded place we have to apply brakes unevenly.
Hence motion is non-uniform at crowded place
8. True as Displacement is a vector quantity and it can be Negative, positive or zero whereas distance is a scalar quantity and it cannot be negative but it can be zero. ... The displacement between two points is equal to distance travelled or less than distance travelled but never greater than distance travelled.
9. True, they are measured in radians
10. True as the motion of a freely falling body is an example of uniformly accelerated motion.as due to the gravitational pull of the earth the body covers equal amount of velocity in equal intervals of time. In another case a ball is thrown from the highest distance and it is probable that it is non uniform motion