Find the vector parallel to the resultant of the vector A=i +4j-2k and B=3i-5j+k
2 answers:
Answer:
Explanation:
<u>Vectors in 3D</u>
Given a vector
A vector parallel to
is:
Where k is any constant different from zero.
We are given the vectors:
It's not specified what the 'resultant' is about, we'll assume it's the result of the sum of both vectors, thus:
Adding each component separately:
To find a vector parallel to the sum, we select k=2:
Thus one vector parallel to the resultant of both vectors is:
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Answer:
Option (b) is correct.
Explanation:
Elastic collision is defined as a collision where the kinetic energy of the system remains same. Both linear momentum and kinetic energy are conserved in case of an elastic collision.
Inelastic collision is defined as a collision where kinetic energy of the system is not conserved whereas the linear momentum is conserved. This loss of kinetic energy may due to the conversion to thermal energy or sound energy or may be due to the deformation of the materials colliding with each other.
As given in the problem, before the collision, total momentum of the system is and the kinetic energy is
. After the collision, the total momentum of the system is
, but the kinetic energy is reduced to
. So some amount of kinetic energy is lost during the collision.
Therefor the situation describes an inelastic collision (and it could NOT be elastic).