Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g), the ground is horizontal, and only the gravitational force acts on the objects. A projectile is launched from the origin at an angle of ? radians to the horizontal and an initial speed of 
Find the position function r(t) for this projectile.
A. r(t) = (50t sin ?)i + (50t cos ? - 16t2)j
B. r(t) = (50t cos ? - 32t2)i + (50t sin ?)j
C. r(t) = (50t cos ?)i + (50t sin ? - 16t2)j
D. r(t) = (50t sin ? - 16t2)i + (50t cos ?)j
Answer: C
You might also like to view...
Use a graphing calculator or computer to determine which of the given viewing windows displays the most appropriate graph of the specified function.f(x) = x2 + 
cos 80x
A. [-2, 2] by [-1, 1] B. [-0.6, 0.6] by [-0.1, 0.6] C. [-10, 10] by [-10, 10] D. [-0.1, 0.1] by [-0.1, 0.1]
Provide an appropriate response. A fish tank pumps 40 gallons of water per minute. How many gallons are pumped per hour?
A. 240 gallons per hour B. 1.5 gallons per hour C. 0.67 gallons per hour D. 2,400 gallons per hour
Use sum-to-product identities to rewrite the expression as a product.cos 61° + cos 35°
A. 2 sin 48° cos 13° B. -2 sin 48° sin 13° C. 2 cos 48° cos 13° D. 2 cos 48° sin 13°
A plane flying horizontally at an altitude of 1 mi and a speed of 550 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 2 mi away from the station.
Select the correct answer. a. ? 476 mi/h b. ? 670 mi/h c. ? 455 mi/h d. ? 570 mi/h e. ? 495 mi/h