https://padlet.com/warregag000/ky5yihnv6rv2 A guide to solving Questions 2 and 3 on 9/23 Sub-assignment en-us 2016-09-23 12:58:16 UTC 2016-09-23 13:13:50 UTC hello@padlet.com warregag000 https://padlet.com/warregag000/ky5yihnv6rv2/wish/125992386 To answer this problem, you first must recognize your givens, as well as acknowledge what you're trying to solve. Question 2A) is asking for impact speed. In other words, they are asking for final velocity. Your givens include initial velocity (0ft/sec since he is being dropped), acceleration (the force of gravity or 32ft/sec^2), and finally distance (40ft). Upon inspection of the various kinematic equations in our arsenal, one can deduce it makes most sense to use the equation, "Vf^2=Vi^2 + 2ad" Once your givens are plugged in and you have fully isolated your remaining variable, you end up with:
Vf=(0^2 + 2*32ft/sec^2*40)^1/2
This comes out to be 50.56 ft/sec]]> 2016-09-23 13:00:03 UTC https://padlet.com/warregag000/ky5yihnv6rv2/wish/125992386 warregag000 https://padlet.com/warregag000/ky5yihnv6rv2/wish/125995695 Also, in this problem, you must first identify unknowns as well as givens. In this case, the problem is asking for time of flight, while every other given is present. A good kinematic equation to be used for this problem is the equation d=.5*Vf*t which can manipulated to become t=d/(.5*Vf)
When plugged in, this equation becomes t=40ft/(.5*50.56ft/sec) which equals 1.58 feet]]> 2016-09-23 13:08:31 UTC https://padlet.com/warregag000/ky5yihnv6rv2/wish/125995695 warregag000 https://padlet.com/warregag000/ky5yihnv6rv2/wish/125997517 This question has a similar ]]> 2016-09-23 13:12:58 UTC https://padlet.com/warregag000/ky5yihnv6rv2/wish/125997517