Question

You have made a pendulum by tying a stone to a string .its time period is one second you want to reduce the time speed

Answer 1

in simple pendulum tied stone is considered to be of negligible mass....and time period ; T=2π*sqrt(L/g)....where L is length of string and g is acceleration due to gravity.. which is of constant value.....to reduce time speed...length should be small...so as to travel lesser diastance...