(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A student uses a force of 24.1 Newtons to push on a 338 gram (.338 kg) mass to compress a spring a horizontal spring a distance of 11.5 centimeters (.115 m). When the student lets go of the mass, the spring uncompresses and shoots the mass away from it.

a) How fast does the mass leave the spring?

b) The spring mass slides along a frictionless surface until it comes to a frictionless incline. How high does it move up the incline.

2. Relevant equations

F = -kx for part a)

I'm pretty sure that b) requires me to relate the problem to energy or power, but I'm not sure how.

3. The attempt at a solution

I assumed that the mass would leave the spring with an acceleration cause by the spring uncompressing. Since 24.1 Newtons was used to compress the spring, the restoring force would also be 24.1 Newtons. Since F=ma, then the mass should accelerate at 71.3 m/s^2.

^This turned out to be wrong. Can someone help me, please.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# How fast does a mass leave a spring?

**Physics Forums | Science Articles, Homework Help, Discussion**