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Verified answer
Diket:m= 5 kg
a= 5 m/s^-2
t= 4s
ditanya: usaha/W?
jawab:
(cari kecepatan akhir dahulu/vt)
vt= vo + a.t
vt= 5.4
vt= 20 m/s
W= 1/2.m.vt^2
W= 1/2 .5 . 20^2
W= 1/2 .5. 400
W= 5 . 200
W= 1000 J
jadi, usaha (W) yg dilakukan sebesar 1000J.
maaf kalau salah :)
(^)= pangkat