Question

A vector is defined as having magnitude of 15 m and a direction of East. Multiply this vector by the scalar value of –6. What is the resultant vector’s magnitude and direction? (1 point)
90 m East
90 m West
-90 m East
-90 m West

Any projectile always has a constant vertical acceleration of _______. (1 point)
9.81 m.s^2
0 m/s^2
-9.81 m/s^2
It is not constant.

Any projectile always has a constant horizontal acceleration of _______. (1 point)
9.81 m.s^2
0 m/s^2
-9.81 m/s^2
It is not constant.

What are the components of a vector C→ if its magnitude is 8.9 m/s and it makes an angle of –40° with the +x-axis? (1 point)
Cx = –5.72 m/s, Cy = 6.82 m/s
Cx = 6.82 m/s, Cy = –5.72 m/s
Cx = –0.643 m/s, Cy = 0.766 m/s
Cx = 0.766 m/s, Cy = –0.643 m/s

Answer 1

Answer:

1) 90 m west

2) -9.81 m/s^2

3) 0 m/s^2

4) Cy = -5.72 m/s, Cx= 6.82 m/s