ZC. The forward force of the surfboard's acceleration is balanced by the backward force of the surfer's mass.
Answer
3
Explanation:
x=
<em>t + 1/2 </em>
<em />
Answer
given,
F₁ is horizontal = 40 N
F₂ is normal = 20 N
F₃ is parallel = 30 N
work done by
W₂ = 0 as force is acting perpendicular to the direction of motion.
as the motion moved to 0.8 cm
W₃ = F₃ x d
W₃ = 30 x 0.8
W₃ = 24 J
W₁ = F₁ x d
W₁ = F₁ cos ∅ x d
W₁ = 40 cos 30⁰ x 0.8
W₁ = 27.21 J
Since force is mass*acceleration,
F = 70kg * 9.8 m/s
