Question #216d6

1 Answer
Feb 11, 2018

238 m//s

Explanation:

KE = 1/2mv^2

where

KE is kinetic energy in J

m is mass in kg

v is velocity in m/s

49.0g = 0.049kg

1392J = 1/2 * 0.049 * v^2

0.049 * v^2 = 2784J

v^2 = 2784/0.049 = 2784000/49

v = sqrt(2784000/49) = 238 (3s.f.)

speed = 238m//s (3s.f.)