a particle moving with constant acceleration can have a velocity that changes sign
true
. If acceleration is zero, an object’s displacement is always zero.
true
For constant acceleration, the displacement in time t is given by s = v+ 1/2 at where v is the initial and a is acceleration
true, formula for acceleration
If two objects start from rest with the same constant acceleration, the one that starts later
can never catch up.
false, once could have started with a higher velocity
If displacement is zero over a time interval, the average velocity is zero.
true
Distance traveled and displacement are always equal for motion along a straight line.
false
displacement could have a direction diff to distancw
In one-dimensional motion, acceleration equals the rate of change of speed.
false, cause its velocity
A negative acceleration always means the object is slowing down.
false
Under constant acceleration, the average velocity over a time interval equals the
arithmetic mean of the initial and final velocities.
true
a car undergoing uniform (constant) acceleration covers equal distances sucessive time intervals
false
velocity is increasing and so is the distance
For constant acceleration, the distances covered in successive equal time intervals form an arithmetic sequence.
false, there is no arithmetic sequence
Under uniform acceleration, the velocity–time graph is a straight line.
true
f an object moves with constant speed, its acceleration is zero.
true, cause the object did not go faster
