Question

what is the mass of a football that has a kinetic energy of 100j and is travelling at 5ms​

Answer 1

Answer:

1/2mv² = 100j

then 1/2 x m x (5)² = 100j

mx25 =200

m = 200 /25 = 8.

Answer 2

Answer:

1/2 mv2 =100j

then 1/2×m×(5)2=100j

m×25=200

m=200/25=8