Question

question 1
1 pts
a football player runs in one direction to catch a pass, then turns and runs twice as fast in the opposite direction toward the goal line. which of the following is a correct expression for the original velocity and the resulting velocity?
-vplayer -2vplayer
2vplayer -vplayer
vplayer -2vplayer
vplayer 2vplayer
question 2
1 pts
identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity
scalar, vector, scalar
scalar, scalar, vector
vector, scalar, scalar
vector, scalar, vector

Explanation:

Step1: Analyze Question 1

Velocity is a vector. Let the original velocity be $v_{player}$. When the player turns and runs in the opposite direction twice as fast, the new velocity is $- 2v_{player}$.

Step2: Analyze Question 2

Mass and number of leaves are scalar - they have only magnitude. Wind velocity is a vector - it has both magnitude and direction.

Answer:

Question 1: C. $v_{player}, - 2v_{player}$
Question 2: B. scalar, scalar, vector