Q. 225.0( 1 Vote )
A soft drink bottle is dropped by a water from the top of a hotel whose height is 100 m. It takes T second to reach the ground. Where will it be at T/2 second?
A. 50 m from top
B. 75 m from bottom
C. 25 m from bottom
D. 40 m from top
Height of Tower = 100 m
Time taken to reach ground = T seconds
Acceleration = a = g = 9.8 ms-2
Initial Speed = u = 0
Final Speed = v
Now, we know that,
At t = T and s = 100 m …..1
Let t = and s = x
So, dividing equation 1 by 2, we get,
x = 25 m
So, 25 m from the top at t = seconds or (100 – 25) m, that is 75 m from the bottom at seconds.
Hence, option B is correct.
Rate this question :
Mathematically prove that acceleration due to the gravity of a body is independent of its mass.
What do you mean by the term ‘free fall’?Lakhmir Singh & Manjit Kaur - Physics
Explain why, if a stone held in out hand is released, it falls towards the earth.Lakhmir Singh & Manjit Kaur - Physics
A bomb is released from an aircraft. Its trajectory is:Evergreen - Science
Two objects of masses m 1 and m2 having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if
(i) one of the objects is hollow and the other one is solid and
(ii) both of them are hollow, size remaining the same in each case. Give reason.NCERT Science - Exemplar