Isn't it supposed to be 6B and not 7B?How do you calculate kinetic energy? I looked at the example but it comes out wrong when I calculate it.
on the kinetic energy you gave us, the 3page #4. it says.... Rodger Maris swung a bat which had a mass of 2kg. at a velocity of 45m/s How many joules of kinetic energy could he give to the ball? The formula is... KE= 1/2mv squared... How do you calculate it because it comes out to be 1/2(2kg)(45m/s)... are we supposed to divide 1/2 to (2kg), or multiply (2kg) and (45m/s).. then divide?
@ Vivian, yes it is 6B. I changed it when I entered it but the change did not show up. When I went back to change it the change showed up. Sorry about that. Kinetic energy is calculated by KE= 1/2mv^2@Ciararemember your order of operations first square the velocity then multiply the mass and then divide by 2 see below. Also remember that 1 kg*m^2/v^2 is 1 JKE= 1/2 mv^2KE= ?m= 2 kgv= 45 m/s1. KE= 1/2(2 kg)((45 m/s)^2) 2. KE= 1/2(2 kg)(2025 m^2/s^2)3. KE= 1/2(4050 kg*m^2/s^2)4. KE= 2025 kg*m^2/s^25. KE= 2025 JCiara if you notice in step 1 (or 2 or 3) you are multiplying by 2 and dividing by 2 so in this particular problem you could actually cancel the 2s out.Ladies, let me know if you are having any other problems!!!God blessC James
Thank you :D i understand now.. :)
Thanks Ms. James!