Motion in a Str...

Assertion The slope of displacement-time graph of a body moving with high velocity is steeper than the slope of displacement-time graph of a body with low velocity.
Reason Slope of displacement-time graph = Velocity of the body.

Assertion Distance-time graph of the motion of a body having uniformly accelerated motion is a straight line inclined to the time axis.
Reason Distance travelled by a body having uniformly accelerated motion is directly proportional to the square of the time taken.

Assertion A body having non-zero acceleration can have a constant velocity.
Reason Acceleration is the rate of change of velocity.

Assertion A body, whatever its motion is always at rest in a frame of reference which is fixed in the body itself.
Reason The relative velocity of a body with respect to itself is zero.

Assertion Displacement of a body may be zero when distance travelled by it is not zero.
Reason The displacement is the longest distance between initial and final position.

Assertion The equation of motion can be applied only if acceleration is along the direction of velocity and is constant.
Reason If the acceleration of a body is constant then its motion is known as uniform motion

Assertion A bus moving due north takes a turn and starts moving towards east with same speed. There will be no change in the velocity of bus.
ReasonVelocity is a vector-quantity.

Assertion The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies.
Reason Sometimes relative velocity between two bodies is equal to difference in velocities of the two.

Assertion Displacement of a body is vector sum of the area under velocity-time graph.
Reason Displacement is a vector quantity.

Assertion Velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to the time axis.
Reason In uniform motion of an object velocity increases as the square of time elapsed.