How much work does a student (m = 60 kg) do when he Climb a tower 80 m high?

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Ideal meters problem. what internal resistance is ideal for a voltmeter? what internal resistance is ideal for an ammeter?