Acar moves 100 meters in 6 seconds. calculate the car's speed.
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Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.