Describir: The effect of handle height and cart load on the initial hand forces in cart pushing and pulling /

  _  __     ___    __    __   _    _      _____     ___      _  _      ___    
 | |/ //   / _ \\  \ \\ / // | || | ||   / ___//   / _ \\   | \| ||   / _ \\  
 | ' //   / //\ \\  \ \/ //  | || | ||   \___ \\  / //\ \\  |  ' ||  | / \ || 
 | . \\  |  ___  ||  \  //   | \\_/ ||   /    // |  ___  || | .  ||  | \_/ || 
 |_|\_\\ |_||  |_||   \//     \____//   /____//  |_||  |_|| |_|\_||   \___//  
 `-` --` `-`   `-`     `       `---`   `-----`   `-`   `-`  `-` -`    `---`