Answer:
Velocity=2.5m/s
KE=4809.375J
Explanation:
Velocity=5m/2s=2.5m/s
KE=½×1539kg×(2.5m/s)²
Convert the mass to kg:
375g = 375/1000kg = 0.375kg
F = ma
-20 = 0.375a
a = -20/0.375
a = -53
The object is accelerating at 53m/s/s backwards assuming that the forward motion is positive.
