Only need solutions don\'t need to show work, need solutions ASAP please Questio

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Only need solutions don't need to show work, need solutions ASAP please

Question 3 (1 point) An airplane is going from city A to city B. City B is located 800km North of city A. The speed of the airplane relative to the wind is 600km/h. Wind is blowing from East to West at 40km/h. Find the speed of the airplane relative to the ground. 1) 598.7km/h 2) 601.3km/h 3) 640.0km/h 4) 560km/h Question 8 (1 point) O An object is projected at a 30 angle with the horizontal. It's initial speed is 99m/s. Find the speed of the object after 4s.. Assume that the air resistance is negligible. 1) 10.3m/s O 2) 85.7 m/s O 3) 86.3m/s O 4) 96.0m/s

Explanation / Answer

8)Ans is:

v = (3) 86.3 m/s

explanation:

Vi = 99 m/s

horizontal velocity remains same but vertical changes with time

v = u + at

vy' = 99 sin30 - 9.8 x 4 = 10.3 m/s

vx = 99 cos30 = 85.74 ms

v = sqrt (85.74^2 + 10.3^2) = 86.3 m/s

3)(4)540 km/h

Va = 600 km/h i; Vw = 40 km/h i

The velocity wrt to ground will be:

v = 600 - 40 = 540 km/h

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