21. A toy car starts from rest and begins to
1 answer:
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The velocity of the combined mass after the collision is 0.84 ms-1.
<u>Explanation:</u>
According to law of conservation of momentum, the change in momentum before collision will be equal to the change in momentum of the objects after collision in isolated system.
But as it is perfectly inelastic collision in the present case, the final momentum will be based on the product of total mass of both the object with the velocity with which the collision occurred. This form is attained from the law of conservation of momentum as shown below:
So as law of conservation of momentum,
Here = 3 kg and
= 2 kg are the masses of objects 1 and 2,
= 1.4 m/s and
= 0 are the initial velocities of object 1 and object 2,
and
are the final velocities of the objects.
So after collision, object 1 get sticked to object 2 and move together with equal velocity =
=
. Thus the above equation will become,
So the final velocity is
Thus,
= 0.84 ms-1.
Answer:
acceleration or a deceleration
Explanation:
The gradient of a position - time graph represent the velocity.
a straight line indicate a constant velocity (gradient ≠ 0)
when it is a parallel line to the time axis , it indicated no movement
when it is a curved line it indicates a changing velocity (either acceleration or a deceleration) as mentioned in the graph
