Question

1.Draw displacement - time graph for the following cases: (a) Two cars A and B , moving in opposite directions on a straight line path with velocity 10 m/s , with an initial separation of 1000 m. Pls answer fast and correct.​

Answer 1

Given:

Two cars A and B move away from each other on a straight line each with velocity 10 m/s. They have an initial separation of 1000 metres.

To draw:

The Displacement-Time graph.

Solution:

• We shall draw the displacement time curve for both cars on the same graph, as it will help in comparison.

• Since they are separated by 1000 m , the initial gap between the curves will be 1000m on the graph.

• Since the cars move with constant velocity (and no acceleration), the curves will be a straight line.

• Lets consider that car A is moving right and car B is moving left. Considering the rightward direction to be positive.

The green line on the graph indicates the curve.

Answer 2

$\huge{\mathbb{\red{ANSWER}}}$

For the time interval of 4h,

Displacement of car A, D

A

=160km

Velocity of car A, v

A

= 4h

160km

=40km/h

Displacement of car B, D

B

=120km−40km=80km

Velocity of car B, v

B = 4h

80km

=20km/h

$\huge{\mathbb{\red{ANs .20km/h}}}$