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In air and in water the same sound travels with different

An object has gravitational potential energy due to its

Two identical arrows, one with three times the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

An object moving at constant speed does so because

 The work you do when pushing a shopping cart three times as far while applying three times the force is

Galileo taught us that if you roll a ball along a level surface it will

 A 5-kg box of books has 75 J of potential energy relative to the ground.  Its height above the ground is

  A 500-kg car and a 2000-kg car are hoisted to the same height. Raising the more massive car requires

 The frequency of a certain wave is 4 Hz and its period is

 The distance traveled by a wave during a single period is