A car travels a distance S on a straight road in two hours and then return to the starting point in the next here hours. Its average velocity is :
(a) S/5
(b) 2S/5
(c) (S/2)+(S/3)
(d) none of the above.
A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true.
(a) its speed is zero.
(b) its acceleration is zero.
(c) its acceleration is opposite to the velocity.
(d) its speed may be variable
if the displacement of a particle is zero, then what can we say about its distance covered ?
(a) it must be zero.
(b) it cannot be zero.
(c) it is negative
(d) it may or may not be zero.
A particle is moving on a straight line path with constant acceleration directed along the direction of instantaneous velocity. Which of the following statements about the motion of particle is true.
(a) Particle may reverse the direction of motion.
(b) distance covered = magnitude of displacement
(c) average velocity is less than average speed
(d) average velocity = instantaneous velocity.
Which of the following statement is false for motion with uniform velocity
(a) The motion is along a straight line path.
(b) The motion is always in the same direction
(c) Magnitude of displacement < distance covered
(d) Average velocity is equal to the instantaneous
Which of the following can be zero when the particle is in motion for some time ?
(a) Displacement
(b) Distance covered
(c) speed
(d) none of the above
The slope of the velocity time graph for retarded
motion is:
(a) Positive
(b) negative
(c) zero
(d) can be +ve, -ve or zero.
the velocity graph of a motion starting from rest with uniform acceleration is a straight line:
(a) Parallel to time –axis.
(b) parallel to velocity axis
(c) not passing through origin
(d) having none of the above characteristics.
What is the angle between instantaneous displacement and acceleration during the retarded motion
(a) Zero
(b) π/4
(c) π/2.
(d) π.
A car accelerates from rest for time t1 at constant rate a1 and then it retards at the constant rate a2 for time t2 and comes to rest. t1/t2 =
(a) a1/a2
(b) a2/a1
(c) a12/a22
(d) a22/a12