Question

A 2-kg object is moving at 3 m/s. A 4-N force is applied in the direction of motion and if the object has a final velocity 7m/s. calculate the distance that the object moves

Answer 1

Intial velocity u=3m/s
final velocity v
2
=u
2
+2as=3
2
+(2×2×5)=29 ⟹v=5.3m/s

KE=
2
1
​
m(v
2
−u
2
)=
2
1
​
×2×((5.3)
2
−3
2
)=20J