Question

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated.
Calculate the total energy of 2.0 kg object moving horizontally at 10 m/s 50 meters above the surface.

a.10. J
b.100 J
c.200 J
d.1080 J

Answer 1

Answer:

i think it is b sorry if im worng

Answer 2

Answer : The correct option is, (d) 1080 J

Explanation :

Total energy = Kinetic energy + Potential energy

$\text{Total energy}=\frac{1}{2}mv^2+mgh$

where,

m = mass of an object = 2.0 kg

v = speed of an object = 10 m/s

h = height of an object = 50 m

g = acceleration due to gravity = $9.8m/s^2$

Now put all the given values in the above expression, we get:

$\text{Total energy}=\frac{1}{2}\times (2.0kg)\times (10m/s)^2+(2.0kg)\times (9.8m/s^2)\times (50m)$

Total energy = 1080 J

Thus, the total energy will be, 1080 J