Water waves in a small tank are 7.5-cm long. They pass a given point at a rate of 2.5 waves per 20 seconds.
A) What is the speed of the water waves?
I
B) What is the period (T) of the waves?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.