What is the forward velocity of a 250 lb stone projectile that leaves a medieval catapult 55 from the ground at 50 m/s?

What is the forward velocity of a 250 lb stone projectile that leaves a medieval catapult 55° from the ground at 50 m/s?

A river flows east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.0 m/s due north in the water.

What is the size of the velocity of the boat as viewed by shore?

A woman throws a javelin 35 mph at an angle 30° from the ground. Neglecting wind resistance or the height the javelin thrower, how fast will the javelin strike the ground?

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