Riverboat and Airplane Problems

The president’s airplane, Air Force One, flies at 250 m/s to the east (compared to the ground). The president visits the pilots in the cockpit. Then he walks to the back of the plane at 1 m/s. What is his speed relative to the ground?

• 249 m/s

• 251 m/s

• 253 m/s

• 248 m/s

Tags

NGSS.MS-PS2-1

If a car passes you going 90 km/hr north while you are driving 80 km/hr north, how far is the car moving relative to your car

• 170 km/hr

• 90 km/hr

• 80 km/hr

• 10 km/hr

A passenger at the rear of a train traveling at 15 m/s relative to Earth throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train.

What is the velocity of the baseball relative to Earth as it leaves the thrower’s hand?

• 30 m/s

• 15 m/s

• 0 m/s

• 20 m/s

A boat with a speed of 4 m/s will cross a 40 m wide river that has a current of 3 m/s. The boat aims directly across the river. How long will it take the boat to cross the river?

• 10 s

• 20 s

• 30 s

• 40 2

A boat with a speed of 4 m/s will cross a 40 m wide river that has a current of 3 m/s. The boat aims directly across the river. How long will it take the boat to cross the river?

• 0 m

• 15 m

• 20 m

• 30 m