Question

On Earth, your comfortable speed of walking is vE = 3 mph. What is your corresponding comfortable walking speed vM on a mysterious habitable planet M (Let gM = 5 m/s2)

(Hint: Assume step length is same on the Earth and the mysterious planet)

a. vM = 2.1 mph

b. vM = 1.8 mph

c. vM = 2.6 mph

d. vM = 1.5 mph

e. vM = 2.3 m/s

Answer 1

ie v^2= 2as   

3^2= 2*9.8*s

   s= .45m

s is same for both planets so v^2= 2 a*s

                                          v= sqrt(2*5*.45)

                                            = 2.12 mph