Will pushing on a car always change the car's mechanical energy? what must happen for the car's kinetic energy to increase?

Abaseball picther can throw a ball at about 90 miles per hour, v = 40 m/s, on solid rock ground. we now put him into space. when he throws the ball, which weighs mb = 0.15 kg moves away from himat the same speed. how long does it take the ball thrown in space to travel the 30 meters to the batter? he weighs mp = 100kg

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The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?