Originally Posted by

**jarny** Can someone please help me? i need this problem by 9:00 pm tonight eastern time: A running student has **HALF** the kinetic energy that his younger brother has. The student **speeds up by 1.3m/s** at which point he has the **same** kinetic energy as his brother. I that student's mass is **twice** as large as his brother's mass, what were the original speeds of both the student and his brother? I would really appreciate if someone could help me, THANKS! The formula for this problem is KE= (1/2)m(v^2) where KE is the kinetic energy in joules, m is mass, and v is the velocity.