# Kinematics (2D) Problem #19 | Clever Condor | Chris Keating

Susan, driving north at 60 mph, and Shawn, driving east at 45 mph, are approaching an intersection. What is Shawn's speed relative to Susan's reference frame?

Susan, driving north at 60 mph, and Shawn, driving east at 45 mph, are approaching an intersection. What is Shawn's speed relative to Susan's reference frame?

Mary needs to row her boat across a 100-m-wide river that is flowing to the east at a speed of 3.0 m/s. Mary can row with a speed of 2.0 m/s.
a) If Mary rows straight north, where will she land?
b) Draw a picture showing her displacement due to rowing, her displacement due to the river's...

When the moving sidewalk at the airport is broken, as it often seems to be, it takes you 50 s to walk from your gate to baggage claim. When it is working and you stand on the moving sidewalk the entire way, without walking, it takes 75 s to travel the same distance. How long will it take you to...

A boat takes 3.0 hours to travel 30 km down a river, then 5.0 hours to return. How fast is the river flowing?

Ted is sitting in his lawn chair when Stella flies directly overhead, going southeast at 100 m/s. Five seconds later, a firecracker explodes 200 m east of Ted. What are the coordinates of the explosion in Stella's reference frame? Let Stella be at the origin, with her x-axis pointing to the east.

A sailor climbs to the top of the mast, 15 m above the deck, to look for land while his ship moves steadily forward through calm waters at 4.0 m/s. Unfortunately, he drops his spyglass to the deck below.
a) Where does it land with respect to the base of the mast below him?
b) Whee does it land...

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 100 m above the glacier at a speed of 150 m/s. How far short of the target should it drop the package?

A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point.
a) What was the bullet's speed as it left the barrel?
b) What was the bullet's speed as it left the barrel?

A ball thrown horizontally at 25 m/s travels a horizontal distance of 50 m before hitting the ground. From what height was the ball thrown?

A physics student on Planet Exidor throws a ball, and it follows the parabolic trajectory shown in the FIGURE. The ball's position is shown at 1 s intervals until t = 3 s. At t = 1s, the ball's velocity is v = (2.0i + 2.0j) m/s.
a) Determine the ball's velocity at t = 0s, 2 s, and 3 s.
b) What...