Exam1-Solutions-S14

# Then the ferry boats velocity wrt the river resolves

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: speed (in m/s) was the ball thrown? (1) 12.3 (2) 14.5 (3) 16.4 (4) 10.1 (5) 7.9 Since the ball is thrown horizontally its initial velocity along the y direction, voy=0. 2 Using v2 = voy + 2a(y − yo ) with a=–g, y = 0 (at the ground) and yo = 23 , 32 or 41 m y yields the magnitude of the y component of the velocity when the ball hits the ground giving: v y = 21.23, 25.04 or 28.35 m . Knowing vy at the ground and the angle s with which it strikes determines vx since, v v 21.23, 25.04 or 28.35 m s tan θ = y ⇒ v x = y = = 12.3, 14.5 or 16.4 m s o vx tan θ tan 60 Since there is no acceleration along the x direction this is vx everywhere including at the throw. Problem 10 A plane traveling north at 200 m/s turns and then travels south at 300 m/s (or 400 m/s, 500 m/s). The change in its velocity is: (1) 500 m/s south (2) 600 m/s south (3) 700 m/s south (4) 100 m/s south (5) 500 m/s north Δv = v f − vi = 300 m/s − ( −200 m/s ) = 500 m/s south (or 600m/s, 700...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online