If |V1⃗⃗⃗⃗ + V2⃗⃗⃗⃗| = |V1⃗⃗⃗⃗ − V2⃗⃗⃗⃗| and V2⃗⃗⃗⃗ is not equal to zero, then which of the following statement is true?- (a) V1⃗⃗⃗⃗ and V2⃗⃗⃗⃗ are parallel (b) V1⃗⃗⃗⃗ and V2⃗⃗ are equal in magnitude,

(c) V1⃗⃗⃗⃗ and V2 ⃗⃗⃗⃗ are perpendicular to each other, (d) none of these

Why is there friction between objects

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by