PPlease help I got only two of them wrong but I don't know which ones

Question 1

What is the best classification for velocity?

a) scalar

b) tensor

c) vector

(I chose vector)

Question 2

What is the value of ax ?

a) a abs (?)

b) a cos (?)

c) a sin (?)

d) a tan (?)

(I chose a tan (?))

Question 3

What is the best classification for speed?

a) scalar

b) tensor

c) vector

(I chose scalar)

Question 4

Consider a projectile launched at 20 m/s over level ground. Which angle above the horizontal will give the greatest horizontal velocity?

a) 10 degrees

b) 30 degrees

c) 45 degrees

d) 60 degrees

e) 80 degrees

(I chose 45 degrees)

Question 5

The instantaneous velocity is...

a) the area under the function of position vs time from an initial point to a final point

b) the average position divided by the average time

c) the slope of a line passing through an initial and final point on a position vs time graph

d) the slope of a tangent line passing through a point on a position vs time graph

(I chose the slope of a tangent line passing through a point on a position vs time graph)

Question 6

What is the value of ??

a) abs^-1 (ay/ax)

b) cos^-1 (ay/ax)

c) sin^-1 (ay/ax)

d) tan^-1 (ay/ax)

(I chose tan^-1 (ay/ax))

Question 7

Where will the projectile have zero vertical velocity?

There were 5 positions in the graph A,B,C,D,E with A at the initial position where the projectile was being thrown, B in the middle of A and C, C at the top (maximum height), D in the middle of C and E, and E where the projectile was about to hit the ground.

a) A

b) B

c) C

d) D

e) E

f) all have the same value

(I chose C)

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