rectilinear motion doubt
for a body thrown w/ initial velocity upward
is the initial velocity and final velocity same( just before touching ground)
🤔
17 Replies
@Gyro Gearloose
Note for OP
+solved @user to close the thread when your doubt is solved. Mention the user who helped you solve the doubt. This will be added to their stats.same motion , a ball thrwon up and reaches down
so at same position same velocity ?
and like that , if thrwon up a velcty of u
at same positiion just before toucin ground final velocity is eqaul to u ?
Yes thats true
I dont think so. how is initial velocity same as the velocity just 1s before touching the ground?
1s?
just before touching the ground , not 1 s
yes, but only if there is no non-conservative force on the body. (e.g - friction)
As the Gravitational Force is conservative in nature,
Total Mechanical Energy of the system (KE + PE) will be conserved
This is not exclusive to 1d motion but also true for motion in plane (e.g.- a projectile)
Even if we induce an Electric Field
the intial velocity will still be the same as final
as electrostatic forces are conservative in nature.
The speed would be same in case of constant acceleration (considering both sign and direction)
One more way of thinking would be
V²=U²+2(O)(acceleration)
|v|=|u|
Now direction would definitely be opposite
speed is same velocity is opposite
its impossible for the velocity to be same as they would be in opposite directionds, but magnitude will be same
I dont get it how is the magnitude of velocity same at same position
is it because distance covered during the flight (both up & down) is the same and also the acceleration will be g (during both upwards and downward motion) ?
kinda, technically it is distance by time that gives you magnitude, but yea since time taken to go up and come down is the same, magnitude is the same (which comes from the fact that acceleration is the same!)
yes sir understood thank you
+solved @Keshav
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