(Answered) A gasoline engine receives 250 j of energy from combustion

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A gasoline engine receives 250 J of energy from combustion and loses 200 J as heat energy to the exhaust. What is its efficiency?

A man exerts a force of 250 N along the inclined plane to load 1000 N crate into a truck. What is the mechanical advantage of the inclined plane?

A car experiences a centripetal acceleration of 9 m/s² when it negotiates a curved level road of radius 4 m. What is its tangential velocity?

Ball A moving along a straight line at 2 m/s collides elastically with ball B of same mass moving at -3 m/s. What is the velocity of the balls A and B after collision?

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