Question

The diameter of the wheel of a tractor is 98 cm. How many
kilometres will it travel in 1000 rotations?
2) The length and breadth of a rectangular plot is 50 m and 40
respectively. It is to be fenced by 5 rounds of a metal wire w
costs SO rupees per metre. Find the cost of fencing the plot.
3) Weight of 36 children in a class is given in kilograms. Draw
frequency table of this data.
42.48.50,49,49,43,44,45,44,48,49,42,49 42.42,49,48,43.50
44.46.49.49.48.49.42.41.50.48.49.42.46.44.46​

Answer 1

Given:

It is observed that during the motion of a body, its acceleration is zero.

To draw:

The Distance-Time and Velocity-Time graph for this situation.

Solution:

First of all, the acceleration of the body is zero, so we can say that the velocity of the body is constant. Hence, the velocity of the body does not increase with time.

So, when we will plot the velocity-time graph, the graph will be a linear line parallel to time axis.

Now, we know that relationship:

$\rm\therefore \: s = u \times t∴s=u×t$

$\rm\implies\: s \propto t \: (for \: constant \: velocity)⟹s∝t(forconstantvelocity)$

So, when we will plot the Distance time graph, the graph will be a linear line with a positive slope.

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Answer 2

Given:

It is observed that during the motion of a body, its acceleration is zero.

To draw:

The Distance-Time and Velocity-Time graph for this situation.

Solution:

First of all, the acceleration of the body is zero, so we can say that the velocity of the body is constant. Hence, the velocity of the body does not increase with time.

So, when we will plot the velocity-time graph, the graph will be a linear line parallel to time axis.

Now, we know that relationship:

$\rm\therefore \: s = u \times t∴s=u×t∴s=u×t∴s=u×t</p><p></p><p>\rm\implies\: s \propto t \: (for \: constant \: velocity)⟹s∝t(forconstantvelocity)⟹s∝t(forconstantvelocity)⟹s∝t(forconstantvelocity)$

So, when we will plot the Distance time graph, the graph will be a linear line with a positive

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