Motion Test - 5...

A boy having uniform acceleration of $$\displaystyle 10\ { m s }^{ -2 }$$ has a velocity of $$\displaystyle 100\ { ms }^{ -1 }$$. In what time the velocity will be doubled?

Uniform linear motion is a/an _______ motion while uniform circular motion is a/an _______ motion. 

Which of the following statement must always be true?

I.If an objects acceleration is zero, then its speed must remain constant.

II. If an objects acceleration is constant, then it must move in a straight line.

III. If an objects speed remains constant, then its acceleration must be zero.

A block is moving in a circular path at constant speed. Which of the following statements is/are true?

I. The velocity is constant.

II. The direction of motion is constant.

III. The magnitude of velocity is constant.

Velocity, being a vector quantity, positive velocity means

The slope of displacement-time graph being negative implies

An object of mass m moving with constant speed $$v$$ completes one round of circular path. Three conditions are given below, which one of the following statements is correct
I. The displacement is zero.
II. The average speed is zero.
III. The acceleration is zero

A car accelerates uniformly so that it goes from a velocity of $$20 {m}/{s}$$ to a velocity of $$40 {m}/{s}$$ in $$5$$ seconds. Find out the acceleration of a car?

A car accelerates steadily so that it goes from a velocity of 20 m/s to a velocity of 40 m/s in 4 seconds. What is its acceleration?  

The graphs below the position versus time for three differences cars 1, 2 and 3. Rank these cars according the magnitudes of their velocities at the time "t" indicated on the graph, greatest first