NCERT Class-9 Science Solutions: Chapter 8-Motion Part 6 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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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