please help, with explanations on how to solve the problem and the correct answe

Question

please help, with explanations on how to solve the problem and the correct answer. ive worked through them but it would be nice to know if im going about them correctly and getting the right answer! thank you! I throw a 0.25kg ball off a cliff 20m high. It strikes the ground 4s later. What was the initial y (i.e. vertical) velocity? ( Indicate the direction as well as magnitude!) It takes a horizontal force of |F1| = 32N pushing a box along a level floor to produce an acceleration of 1m/s^2 in the same direction as F1. The box weighs 80N and there is friction between the box and the floor. and the box is moving in the same direction as the acceleration. a) Draw a force or free body diagram showing your coordinate system and showing all the forces acting on the box. b) Write down Newton

Explanation / Answer

1. h = ut + 1/2*gt^2 20 = u*4 + 1/2*9.81*4^2 u = -14.62 m/s Initial velocity is 14.62 m/s towards the sky. 2. W = 80 N m = 80/9.81 = 8.15 kg Newton's law: ma = F1 - Fric 8.15*1 = 32 - Fric Fric force = 32 - 8.15 = 23.845 N Fric force = coeff of fric*W Coeff of fric = Fric force / W = 23.845/80 = 0.298

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.