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Question

72% Sat Jun 11 11:01:21 AM Qu E Chrome File Edit View History Bookmarks People Window Help Josh Motion in multiple dimens C Chegg Study I Guided Sol www.webassign.net /web/Student/Assignment-Responses/last?dep 13907358 App Bookmarks Apple YouTube home Watch Live Sports E O tech Destiny LFG.Net l The faculty.pnc.edu/ptes DTR Destiny Tracker De Eii C. Henry Edwards, Section 3.3 2. -2 points CJ10 3. 015 My Notes Ask Your Teacher A skateboarder shoots off a ramp with a velocity of 6.5 m/s, directed at an angle of 55 the end above horizontal. The of the ramp is 1.3 m above the ground. Let the x axis be parallel to the ground, the y direction be vertically upward, and take as the origin the point on the ground directly below the top of the ramp. (a) How high above the ground is the highest point that the skateboarder reaches? (b) When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp? Additional Materials Section 3.3 3. -1 points CJ10 3. 018 My Notes Ask Your Teacher A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 669 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.024 m below the center. What is the horizontal distance between the end of the rifle and the b eye? Additional Materials Section 3.3

Explanation / Answer

2) a)   Here, v2 - u2 = 2as

=>    (6.5 * sin55)2 = 2 * 9.8 * h

=> h = 1.446 m

=> highest point reached =   1.3 + 1.446 = 2.746 m

b)    time taken =   6.5 * sin55/9.8

                          = 0.543 sec

=> horizontally from end of ramp =   6.5 * cos55 * 0.543

                                                      = 2.024 m

3)   Here, time taken = sqrt(2 * 0.024/9.8)

                                   = 0.07 sec

=> horizontal distance = 669 * 0.07

                                     = 46.83 m

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