Please help with part A-C, and show step by step Part A What is the speed of the
ID: 1779426 • Letter: P
Question
Please help with part A-C, and show step by step
Part A What is the speed of the stone when it reaches point B? A 15.0 kg stone slides down a snow-covered hill (the figure (Figure 1)), leaving point A with a speed of 12.0 m/s. There is no friction on the hill between points A and B, but there is friction on the level ground at the bottom of the hill, between B and the wall. After entering the rough horizontal region, the stone travels 100 m and then runs into a very long, light spring with force constant 2.20 N/m. The coefficients of kinetic and static friction between the stone and the horizontal ground are 0.20 and 0.80, respectively m/s Submit My Answers Give Up Part B How far will the stone compress the spring? Figure 1 #1 of 1 In Submit My Answers Give Up 20 m Part C Will the stone move again after it has been stopped by the spring?Explanation / Answer
(A) Applying energy conservation,
Pei + KEi = PEf + KEf
m g (20) + m (12^2) /2 = 0 + m v2^2 /2
v2 = sqrt[ (2 x 9.8 x 20) + 12^2]
v2 = 23.2 m/s .....Ans
(b) work done by friction + work done by spring = change in KE
-(0.20 x 15 x 9.8 x 100) - (2.20 x^2 / 2) = 0 - (15)(23.2^2)/2
- 2940 - 1.1x^2 = - 4020
x = 31.3 m
(c) Yes.