Question 3 10.5 pts A mass of 5 kg is moving at 4.3 m/s on a horizontal surface

Question

Question 3 10.5 pts A mass of 5 kg is moving at 4.3 m/s on a horizontal surface and the enitre surface has friction with a coefficient of kinetic friction of 0.80. If y = 0 m for gravitational potential energy is the horizontal surface, how far does the object slide before it stops, in meters? Question4 10.5 pts An object is in free fall and at some point above the ground it has 50 Joules of kinetic energy and 21 Joules of potential energy if the ground is the y-O m point. Some time later it has 15 Joules of kinetic energy. How much potential energy does it have at that point in Joules?

Explanation / Answer

(3)

Apply kinematic equation

v^2-u^2 = 2as

v^2-u^2 = 2( - uk g) s

s= v^2-u^2/ 2( -uk g)

= 0^2 - 4.3^2/ 2( -0.8*9.8)

=1.179 m

(4)

Appy conservation of energy

KEi+PEi= KEf+PEf

50+ 21 = 15+PEf

PEf = 56 J

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

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