Projectile Motion

What is the sign of horizontal velocity V_x at point B

• +

• -

• 0

What is the sign of vertical velocity V_y at point B

• +

• -

• 0

What is the sign of the vertical velocity V_y at point C, before hitting the ground?

• +

• -

• 0

What is the sign of the horizontal velocity V_x at point C, before hitting the ground?

• +

• -

• 0

What happens to the horizontal velocity V_x when the ball moves from A to B (going up)

• increases

• decreases

• remains constant

What happens to the vertical velocity V_y when the ball moves from A to B (going up)

• increases

• decreases

• remains constant

What happens to the horizontal velocity V_x when the ball moves from B to C (going down)

• increases

• decreases

• remains constant

What happens to the vertical velocity V_y when the ball moves from B to C (going down)

• increases

• decreases

• remains constant

A projectile is launched with 45m/s at an angle 30^o above the horizontal. What is the V_x when the projectile hits the ground.

• 22.5 m/s

• 35.7 m/s

• 39 m/s

• 45 m/s

A projectile is launched with 45m/s at an angle 30^o above the horizontal. What is the V_y when the projectile hits the ground.

• + 22.5 m/s

• + 39 m/s

• - 22.5 m/s

• - 39.5 m/s