What is the magnitude of the resultant vector formed?

• -6 m/s

• 6 m/s

• -2 m/s

• 2 m/s

What is the magnitude of the resultant vector formed?

• 7 m/s

• -7 m/s

• 3 m/s

• -3 m/s

Which vector(s) show a negative direction?

• A, C, E

• B & D

• A & B

• A only

Answer explanation

Down and left are the negative directions.

I launched a cannon at a 60 degree angle with a v_i=20m/s. What other angle can I launch my cannon at v_i=20m/s and have the cannonball land in the same place?

• 40 degrees

• 30 degrees

• 20 degrees

• 15 degrees

Answer explanation

Complementary launch angles have the same range. Complementary means the two angles add up to 90 degrees.

Using a²+b²=c², what is the magnitude of the orange vector, c?

• -1 m/s

• 2.6 m/s

• 5 m/s

• 4.5 m/s

A watermelon is launched at a 50 degree angle with a total v_i=8 m/s. What is the initial velocity in the vertical dimension: v_iy?

• 8 m/s

• 6.95 m/s

• 6.12 m/s

• 5.14 m/s

A baseball is thrown up at an angle of 75 degrees with a total initial velocity, v_i=12 m/s. What is the initial velocity in the horizontal dimension, v_ix?

• 12 m/s

• 11.6 m/s

• 3.1 m/s

• 15 m/s

What is the correct name for the path of a projectile?

• Vector

• Trajectory

• Parabola

• Resultant

Which of the following is NOT correct about projectile motion?

• The faster the v_x the farther horizontal range, d_x

• The vertical velocity of the object in this diagram at the top of the path is v_y=0m/s

• The acceleration in the vertical y-direction is g which is 9.8m/s²

• The acceleration in the horizontal x-direction is 1m/s²

Tags

NGSS.HS-PS2-4

The cannon shoots horizontally with a v_x=18m/s. There is no angle. Which of the following is NOT true?

• The v_x for the entire path is 18m/s

• The v_y at 0 seconds is 0m/s

• The v_y is fastest JUST BEFORE the ball hits the ground

• The v_x is slowest JUST BEFORE the ball hits the ground

Answer explanation

There is no acceleration in the x direction. The v_x is the same the entire path.

Tags

NGSS.HS-PS2-1