Answer:

9261 J

Solution:

Given:

m = 42kg

v = 21 m/s

Required:

KE

Solution:

KE = [tex]\frac{1}{2}[/tex]mv²

= [tex]\frac{1}{2}[/tex](42kg)(21m/s)²

KE = 9261 J

Answer:

9702J

Explanation:

formula:KE=½mv²

=½(42kg)find the half of the given number. (21m/s)²---21×21 times it by itself.

=(22kg)(441m/s) if you get na you times these two

441

×. 22

9,702