Q. 194.2( 13 Votes )
An object is dropped from rest at a height of 150 m and simultaneously another object is dropped from rest at a height 100 m. What is the difference in their heights after 2 s if both the objects drop with same accelerations? How does the difference in heights vary with time?
let h1=150m and h2=100m
Then, the difference in height h=(150-100)m=50 m
Distance travelled by first body in 2s is given as,
Distance=ut + at2
Now, if the Initial speed(u) = 0(when the object was at rest)
Ans, the time, t =2s
So, by substituting the values, we get,
S = 0 +g× (2)2
S = 0 +g× 4
S = 0 +× 9.8 × 4
S = 19.6 m
So, After 2s, the height of the first object, h1=150-19.6
So, After 2s height of the second object, h2=100-19.6
Thus, after 2s difference of height= h1 - h2 (150-19.6) - (100-19.6) =50 m
So, after 2s difference height will be 50 m = initial difference in height
Thus, the difference in height of the object will remain same because the height does not vary with time.
Rate this question :
Given figures represent the motion of two objects P and Q. Which of the objects has positive acceleration and which one has negative acceleration?
All In One - Science
Fill in the blanks.
(i) ………..is the term used for negative acceleration.
(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is …………….. .All In One - Science
There is an argument about uniform acceleration between Mr X and Mr Y. Mr X says “acceleration means that farther you go faster you go”. Mr Y says “acceleration means that longer you go the faster you go”. Whose statement is correct?Evergreen - Science
Uniform and non-uniform accelerationEvergreen - Science
When you apply brakes to a car, in which direction is its acceleration?Evergreen - Science
You are sitting in a stationary car. There is a helium balloon tied to its floor. You accelerate and obviously feel like you are being pushed backwards (against the direction of your accelerations). The balloon.All In One - Science
Give an example of negative acceleration from daily life situation.Evergreen - Science
What does the slope of a velocity – time graph represent?Evergreen - Science