Question

how did the new teacher start sprrading castetidm the class

Answer 1

On the basic of brilliant students and poor in studies I think so.

Answer 2

Kinetic energy=1/2*mv sq.

So, Kinetic energy=1/2*20*5*5

=1/2*20*25

=250

So, Kinetic energy possessed by the moving body is 250 Joules