﻿ 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                         from Physics Motion in A Plane Class 11 Manipur Board

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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 scalar quantities.

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What is a vector quantity?

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