Un automóvil de juguete de 50 g recorre una pista con velocidad de 5 m/s que mantiene hasta llegar a una pendiente con fricción que lo deja 30 cm más arriba con una velocidad de 3 m/s. ¿Qué trabajo realizó la fricción en el juguete?
A. 0,253 J.
B. 0,147 J
C. 0,147 J.
D. 0,253 J.

si alguien es bueno en física porfa ayuda

In guinea pigs, assume black coat is completely dominant over white. to determine whether an unknown black guinea pig is pure or hybrid black, it should be crossed with bb, bb, bb

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?