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