Question

Page 1 1 3 2. Question 7 (3 points) You set up a ramp as depicted to practice your skateboard skills. The ramp is a wooden board 7.0 m long and is propped up between the ground level at one end and 1.0 m at the other end. You approach the ramp from the left (lower ground) at 14 m/s. How fast are you once you get past the ramp (higher ground)? Assume your mass is 70 kg and friction is negligible. 4 5 6 ✓ ✓ 7 8 9 Your Answer: ✓ 10 11 12 Answer 13 ✓ Question 8 (5 points) You set up a ramp as depicted to practice your skateboard skills. The ramp is a wooden board 9.5 m long and is propped up between the ground level at one end and 1.3 m at the other end. You approach the ramp from the right (higher ground) at 12 m/s. How fast are you once you get past the ramp (lower ground)? Assume your mass is 90 kg and a constant friction of 79 on the ramp. Your Answer:

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Answer 1

Question 71 im THOG 45 The ni = = 14 mis Khi hizo Im of by o tem has no dissipative force šo, energens must be wnst. A body with muss ms with velocity v and at a height h, the total energy of the body, E = mgh + 1 m 2 here, due to energy convers Ei Ef => nghi + mv, given in tiah height initial final height = higher ground hg 1.-= have to find ghi + £ vie ke ghg glhi-hg 2 + 1 2 0 2 = 9,8 (0-1) in e tight ground level, y hi 20 initial velocity of sketer, vi =14m|s adm final velocity of go, g= 9.8m152 142

If 18.28 mis So, you get past the ramp at speed of = 18.28 mis

hi=1.3m V 12m/s 20. ff -79 20 h=1.3m was b= 6. 984 A body of mass in with relocity to at a height of he, the energy of body, the m=90kg for cu f = 2 yout +

here dissipative frictimal fonte present. 20 (initial energes) (finad energos) + ( energy loss due to friction). => 1 / 2 1 / 2 mv mvh + Anghi £ mg ² + mighg + Fj. & energy loss = ff .L given, mass of body to goky frictional force, I f = 29 length of ramp id=9.6- initial height final height lower ground ang hizhor ground, or ki= b.3.com 20 9,8 m/s2 Vi = 12 mis ionitial velocity, final relocity, wo have to be found *14x90x 122)+(90*9.8x1.9)-lá x90x742)+(79 x9's) (< x90x4938+ (90x9.8*108) -(70*9.5) xgo مه 12.36 m/s Sex you past the ramp (lower ground) at speed of g = 18.36 mis