2. John, whose mass is 70 kg, rolls along the sidewalk on in-line skates at 5.55 m/sec towards his sister Sue whose mass is 50 kg coming towards him at a
velocity of 4.5 m/sec. John grabs Sue's hand and pulls her with him. Assuming a
frictionless surface, what is their velocity as they continue to roll down the
sidewalk?

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.