Car A mass 1200kg, approaches a stop sign at 18 m/s. Car B, mass 800kg, is waiting at this same stop sign when it is rear ended by car A. After the collision their bumpers lock and move into the intersection. Find the velocity of the two cars immediately after the collision.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?