Afootball field is 100 yards long. if it takes a person 20 seconds to run its length, how fast were they running? record your answer in yd/s and m/s.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Acar jack with a mechanical advantage of 6 needs to produce an output force of 600 n to raise a car. what input force is required? 6 n 100 n 600 n 3,600 n

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.