Solved: Suppose the 2.0-kg model car in Exercise 6.43 is

Chapter 6, Problem 42E

(choose chapter or problem)

Suppose the 2.0-kg model car in Exercise 6.41 is initially at rest at x = 0 and \(\vec{F}\) is the net force acting on it. Use the work–energy theorem to find the speed of the car at

(a) \(x=3.0 \mathrm{~m}\);

(b)\(x=4.0 \mathrm{~m}\);;

(c) \(x=7.0 \mathrm{~m}\);.

At a waterpark, sleds with riders are sent along a slippery, horizontal surface by the release of a large compressed spring. The spring with force constant 𝑘 = 40.0 N/cm and negligible mass rests on the frictionless horizontal surface. One end is in contact with a stationary wall. A sled and rider with total mass 70.0 kg are pushed against the other end, compressing the spring 0.375 m. The sled is then released with zero initial velocity. What is the sled’s speed when the spring (a) returns to its uncompressed length and (b) is still compressed 0.200 m?

Equation Transcription:

 

Text Transcription:

x=0

Vec  F

x=3.0 m

x=4.0 m

x=7.0m