Question

A body released from the top of a tower falls througha height of 5m during the first second of its fall and35m during the last second of its fall. The height ofthe tower is(A) 80 m(B) 60 m(C) 40m(D) 20 m​

Answer 1

Answer:

80m

Explanation:

they have given that it covers 35 metre in the last second

so now let us calculate that last second value

(refer image)

we got last second value as 4 second which means that the whole motion is 4 seconds.

so now we can calculate that how much it covers in 4 seconds and that is nothing but height of the tower. (refer image)

NOTE: displacement in n seconds is different from displacement in nth second

Meaning of above sentence in our question:

• In aur question 35 metre is nothing but displacement in 4th second and 80m is nothing but displacement in 4 seconds

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