Question #216d6

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Answer 1 · 2018-02-11T18:00:55

#238 m//s#

#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.)