.Kinetic-energy-formula{width:151px; height:67px ;}
.Kinetic-energy-problem{width:154px; height:126px ;}
.Kinetic-energy-problem2{width:138px; height:180px ;}
.Kinetic-energy-formula2{width:145px; height:45px ;}
.Kinetic-energy-problem3{width:187px; height:213px ;}
.Kinetic-energy-problem4{width:206px; height:215px ;}
.energy-formula{width:99px; height:107px ;}