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Class 10 Class 12

Two cars A and B are travelling in same direction with speed  respectively  When car A is d distance behind the car B, the brakes on A are applied, causing retardation   Show that to prevent a collision between A and B it is necessary that

Here, inorder to prevent the collision of car A with B, the relative velocity of car A w.r.t. B should reduce to zero before car A undergoes the relative displacement of d w.r.t. car B.

Initial velocity of car A =

Initial velocity of car B =

Therefore,

Initial relative velocity of car A w.r.t. B is,

Acceleration of car A =

Acceleration of car B = 0

Acceleration of car A w.r.t. car B =

The relative displacement of car A w.r.t car B, when the relative velocity of car A w.r.t. B decreases to zero is given by,

For collision to avert S should be less than d.

i.e.                        S < d

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Give three examples of vector quantities.

Force, impulse and momentum.
865 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

814 Views

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views