Answer :
Final answer:
The kinetic energy of the boy and his skateboard is 1,470 J.
Explanation:
To find the kinetic energy (KE) of the boy and his skateboard, we need to calculate the KE for each separately and then add them together. The formula for KE is KE = 0.5 * mass * velocity squared.
KE of the boy = 0.5 * 52 kg * (7 m/s)^2 = 1,274 J
KE of the skateboard = 0.5 * 4 kg * (7 m/s)^2 = 196 J
Total KE of the boy and his skateboard = 1,274 J + 196 J = 1,470 J
Therefore, the correct answer is (a) 1372 J.
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