Given :
Mass of box , m = 250 kg.
Force applied , F = 285 N.
The value of the incline angle is 30°.
the coefficient of dynamic friction is .
To Find :
The speed with which the box is moving with, assuming it takes 4 seconds to reach the top of the incline.
Solution :
Net force applied in box is :
Acceleration , .
By equation of motion :
Therefore, the speed of box is 12.04 m/s.
Hence, this is the required solution.
Answer:
Explanation:
The principle of energy conservation states that energy is transformed from one form to another, in this case, the potential energy will be transformed into kinetic energy. When the Rock is at the highest point, its potential energy is maximum and, as the rock falls, its potential energy decreases as it increases its kinetic energy, the kinetic energy will be maximum at the time that the rock hits the ground, the value of this energy is equal to that of the rock at the time it is located in the top of the mountain.
Stoping distance = (velocity) ^2/2a
when K.E. is large velocity is large because K. E. =mv^2/2
so large ke large v large stopping distance