velocity of object just before hitting the ground = 10 m/s
10 m/sExplanation:
here's the solution : -
=》mechanical energy is always constant, when the object is at the top of the building , the object has potential energy but no kinetic energy,
so, at the top of the building the mechanical energy = potential energy = 100 J
but at when it is dropped from the building, the whole potential energy get converted into kinetic energy, just before reaching the bottom .
so, mechanical energy in the object just before hitting the ground = kinetic energy
( potential energy = 0 )
So, kinetic energy = 100 J
now, we know
=》
( since, mass = 2 kg )
=》
=》
=》
so, velocity of object just before hitting the ground = 10 m/s
Answer:
Acceleration acts always in the direction. Of the displacement. Of the initial velocity.
Explanation:
speed is just a measurement of relative movement, so you can round a corner with a constant speed. velocity is movement in a particular direction (it has a direction, vector),so you can't round a corner with a constant velocity
Answer:
The value of final velocity of the first hockey puck 2.3
Explanation:
Mass of hockey puck = m
Initial velocity
From conservation of momentum principal
4.5 m = m + m × × 3.5
= 1.5
0 = m + m × × 3.5
= - 1.75
Now final velocity of first puck
Put the values in above formula we get
2.3
This is the value of final velocity of the first hockey puck.