Question

7) A stone is thrown with an initial speed of 15 m/s af an angle of 53° above the horizontal from the top of a 35 m building. If g 9.8 m/s? and air resistance is negligible, then what is the speed of the rock as it hits ground? a. 15 m/s b. 21 m/s c.) 30 m/s 36 m/s k star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? (g-9.8 m/s') a. 0.42 s b. 0.84 s c. 1.25s d. 1.68 s A river flows due east at 3.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant velocity of 10 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore? a. 6 m b. 30 m c. 60m d. 90 m 9. 10. A projectile is fired at an angle of elevation of 60°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector? a. 160° and 40° b. 20° and 70° 90° and 60° d. none of the above

I need clear drawings and explanations for problems 7 and 10. Please include visuals for both.

Answer 1

Solution 7)