แนวข้อสอบ Physics (Integrated-Science) Student Pilot Thai Vietjet

แนวข้อสอบฟิสิกส์ Student Pilot Thai Vietjet 

A bullet of mass 10kg was fired from a gun and moved with a speed of 20 m/s. what was the kinetic energy of the bullet?

A) 400 J

B) 800 J

C) 1,000 J

D) 2,000 J

E) 2,400 J

Solution Kinetic Energy, K.E =?

mass(m) = 10kg

velocity(v) = 20 m/s

K.E = x mass x (velocity)²

= x 10kg x (20m/s)²

= x 10 x 20m/s x 20m/s

= 2000J

Kinetic Energy= 2000J

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