NCERT Class-9 Science Solutions: Chapter 8-Motion Part 6

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Question 23:

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds.

Answer:

Using the equation of motion

Distance travelled in ,

Similarly, distance travelled in

Distance travelled in the interval between second

Question 24:

Two stones are thrown vertically upwards simultaneously with their initial velocities respectively. Prove that the heights reached by them would be in the ratio of (Assume upward acceleration is –g and downward acceleration to be +g).

Answer:

We know for upward motion

But at highest point

Therefore,

For first ball,

And for second ball,

Thus

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