Answer:
last one which is; All the above.
Answer: 1925 joules
Explanation:
weight of man = 550 N
height climbed = 3.5m
Work = ?
Since, work is done when the man pulled his weight over the height; work is expressed as the product of weight and height climbed
i.e Workdone = 550N x 3.5m
= 1925 joules
Thus, the man did a work of 1925 joules while climbing
Answer: Option C) 9.63 joules
Explanation:
Mass of object = 8.8kg
Speed of object = ?
Kinetic energy = ?
Momentum of the object = 13 kgm/s
Recall that momentum is a product of mass M and speed V of a moving object.
Thus, Momentum = Mass x Speed
13 kgm/s = 8.8kg x V
V = (13kgm/s ➗ 8.8kg)
V = 1.48 m/s
Now, that the speed of the object is known, calculate its kinetic energy. And, its kinetic energy depends on its mass M and speed, V
Thus, Kinetic energy = 1/2 x mv^2
= 1/2 x 8.8kg x (1.48m/s)^2
= 0.5 x 8.8kg x (1.48m/s)^2
= 4.4 x (1.48m/s)^2
= 9.63 joules
Thus, the kinetic energy of the object is
9.63 joules
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
