Compare the travel times for the projectiles launched at 30° and 60° in Fig. 4-15, both of which have the same starting and ending points.

(Figure 1)A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d₁ (from A to C) is 200 m, the distance d₂ (from C to B) is 150 m, and the speed vr of the current in the river is 5 km/hour. Suppose that the swimmer's velocity relative to the water makes an angle of 0 = 45 degrees with the line from A to C, as indicated in the figure. To swim directly from A to B, what speed us, relative to the water, should the swimmer have? Express the swimmer's speed numerically, to three significant figures, in kilometers per hour.

Jamir fired a 105mm artillery with a projectile exit velocity of 250 m/s. If the tip of the barrel is 2 meters above the ground, and the angle of inclination of the barrel is 60°. Determine the distance traveled by the projectile in meters assuming air resistance and Coriolis Effect is negligible.

True or False, An object launched horizontally off a cliff will have no velocity initially in the y-direction.