3) An athlete swims the length of a 50-m pool in 20 s and makes the return trip to the starting position in 22 s. Determine her average velocities in (a) the first half of the swim, (b) the second half of the swim, and (c) the round trip.​

If a simple machine reduces the strength of a force, what must be increased?

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)