Acceleration of free falling object on planet X

AI Thread Summary
An object thrown upward on planet X with an initial velocity of 5 m/s returns to its starting point in 3 seconds. The acceleration of free-falling objects is calculated using the formula a = (vf - vi) / t. The final velocity (vf) is zero at the peak height, which occurs at 1.5 seconds. The correct acceleration, as stated in the textbook, is -3.3 m/s², indicating a stronger gravitational pull than initially calculated. Understanding the time to reach maximum height is crucial for solving such problems accurately.
1irishman
Messages
243
Reaction score
0

Homework Statement


While on planet X, an object is thrown vertically upward with an initial velocity of 5m/s. If this object returns to the point of release in 3s, what is the acceleration of a free falling object on this planet?


Homework Equations


a=vf-vi/t


The Attempt at a Solution


0-5/3
= -1.6m/s^2

The answer is -3.3m/s^2 in the book...i don't understand how they arrived at that?
 
Physics news on Phys.org
Hi 1irishman, welcome to PF.
vf is zero when the object reaches the maximum height.
What is the time taken by the object to reach that point?
 
1.5s
 
thank you rl...i see now.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Is Free Fall Acceleration Constant Until An Object Hits the Ground?
Replies
8
Views
2K
Reasoning/evaluation: Free fall motion with constant acceleration
Replies
28
Views
3K
A planet of mass M and an object of mass m
Replies
6
Views
1K
Homework help: Work and Energy, Free fall
Replies
6
Views
1K
Free fall velocity and distance
Replies
34
Views
3K
Calculate the Acceleration of this Car
Replies
7
Views
921
Linear Motion and Free Fall: Solving Projectile Motion Problems
Replies
4
Views
2K
Find the height of a free falling object
Replies
7
Views
2K
Velocity when falling into planet
Replies
16
Views
2K
Calculating acceleration of gravity on a planet
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top