Download the app

Questions  

A body falls freely from the top of a tower. It covers 36% of the total height in the last second before striking the ground level. The height of the tower is 

Remember concepts with our Masterclasses.

80k Users
60 mins Expert Faculty Ask Questions
a
50 m
b
75 m
c
100 m
d
125 m

Ready to Test Your Skills?

Check Your Performance Today with our Free Mock Tests used by Toppers!

detailed solution

Correct option is D

Let height of tower is h and body takes t time to reach to ground when it fall freely.

h=12gt2 .......... (i)

In last second i.e. tth sec body travels = 0.36 h

It means in rest of the time i.e. in (t-1) sec it travels

=h0.36h=0.64h

Now applying equation of motion for (t – 1) sec

0.64h=12g(t1)2 ....... (ii)

From (i) and (ii) we get,

t=5sec and  h=125m.

Talk to our academic expert!

+91

Are you a Sri Chaitanya student?

ctaimg

Create Your Own Test
Your Topic, Your Difficulty, Your Pace



Practice More Questions

Easy Questions

Moderate Questions

Difficult Questions


Download the app

phone icon
whats app icon