Question

A pulse is generated at one end of the slinky of length 10 metre. The pulse returns back to its point of generation in 10 seconds. Calculate the velocity of pulse in slinky. Please tell whether the answer is 2 metre per second or 10 metre per second

Answer 1

Time taken by pulse to return back  = 10 Sec

length of slinky  =10 m

thus length covered by pulse in 10 sec = 20 m

thus velocity of pulse = 20/10
                                   = 2 m per sec

Answer 2

Time taken by pulse to return back = 10 Sec

length of slinky =10 m

thus length covered by pulse in 10 sec = 20 m

thus velocity of pulse = 20/10

= 2 m per sec