A75-kg refrigerator is located on the 70th floor of a skyscraper (300meters a over the ground) what is the potential energy of the refrigerator?
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The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

What object a collides with object b and bounces back its final momentum is?