A child is pulling two red wagons, with the second one tied to the first by a (non-stretching) rope. Each wagon has a mass of 14 kg. If the child exerts a force of 32 N for 6.0 m, how much has the kinetic energy of the two-wagon system changed?

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz