Question

a freely falling body reaches the ground after 4s ,what is the height which it reaches?​

Answer 1

Answer:

Which of the following is correct for inversion, temperature in a real gas? (A) The gas can be liquefied by compression at this temperature (B) Joule - Thomson coefficient (uJT) = 0 at this temperature (C) Below inversion temperature, a compressed gas undergoing unrestricted expansion shows a negative temperature change (D) Above this temperature JT has negative value

Answer 2

Given: A freely falling body reaches ground after 4 seconds

To find: Height which the body reaches

Explanation: Since the time taken for going up is equal to time taken for coming down for any body, the time taken for coming down is= 4/2= 2 sec

Now, time taken= 2 s

acceleration due to gravity= 10m/s^2

Velocity at highest point(u)= 0

Using kinematics formula, height= ut+1/2at^2

= 1/2 * 10 * 2^2

= 20 m

Now, height is constant for coming down and going up.

Therefore, the height that the body reaches is 20 m.