Can an object's velocity changwe direction when its acceleration is constand. support your answer with an example.
A) No this is not possible ebcause its always speeding up.
B) No this is not possible becayse its always speeding or always slowing but it can never turn around
C) yes, thi sis possible and the car that starts from rest speeds up, slows to a stop and then backs up is an example
D) Yes, this is possiblr a rock thrown straight up is an example.
2007-01-26 05:15:55 · 3 answers · asked by Julie Kim 1 in Science & Mathematics ➔ Physics
The correct answer is D ... yes, it can change direction.
This is because the formula for one dimensional motion is:
(final velocity)^2 = (initial velocity)^2 + 2*(acceleration)*(distance)
In the case of a rock thrown upward, the initial velocity is positive (goes away from the ground). Gravity is an acceleration in the downward (negative) direction. If (2*acceleration*distance) is greater than the square of the initial velocity, then the resulting velocity will be in the opposite direction ... like the rock falling back to the ground.
2007-01-26 07:38:03 · answer #1 · answered by CanTexan 6 · 0⤊ 0⤋
I'll go with D. An object can speed and slow down at the same rate or acceleration. So for a rock being throw straight up, its velocity is slowing down as it goes up and speeds up as it comes down but gravity (or acceleration) stays constant at 9.8 m/s.
2007-01-26 13:28:44 · answer #2 · answered by r_leucht 2 · 1⤊ 0⤋
Imagine your car just got hit by a train!
2007-01-26 13:26:28 · answer #3 · answered by Avatar user1 1 · 0⤊ 0⤋