Step 1 220 - 70 (your age) = 15 (estimated maximal heart rate MHR)
Step 2
(MHR) -
(Resting HR) =
(Heart Rate Reserve)
Step 3
(Heart Rate Reserve) *.60 (lower intensity) =
+
(Resting HR) =
Step 4
(Heart Rate Reserve) *.80 (higher intensity) =
(Resting HR) =

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?