A train is travelling east along a straight run of track at 51.0 km/hr. Inside,

Question

A train is travelling east along a straight run of track at 51.0 km/hr. Inside, two siblings 1.50 m apart are playing catch directly across the aisle. The kid wearing a P.J.Harvey T-shirt throws the ball horizontally north. The ball crosses the train and is caught 0.90 s later by her little brother. (Ignore any effects of gravity or friction.)

a)Find the magnitude of the ball's velocity from the little brother's point of view.

b)What is the magnitude of the velocity of the ball as seen by someone standing still outside the train?

c)What is the angle between the direction of the ball and the direction of the train as measured by someone standing still outside the train?

Explanation / Answer

Speed of the train ,v=51 km/hr

Distance between siblings,d=1.5m

time,t=0.9 s

So for the little brothers view the velocity of the ball is 1.5 m/s

For a person seeing outside the speed of the ball is 51 km/hr

The angle will be 180 degree

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