Answer:
C) 100 joules
Explanation:
The kinetic energy of an object is given by:

where m is the mass of the object and v its speed.
In this problem, we have an object of mass m = 50 kg and v = 2 m/s, so by using the formula we can find its kinetic energy:

Answer:
The distance between the slits is 3.55 μm
Explanation:
Given that,
Order number = 3
Wave length = 610 nm
Angle = 31°
We need to calculate the distance between the slits
Using formula of distance of slit


Where, n = order number
= wavelength
Put the value into the formula



Hence, The distance between the slits is 3.55 μm.