0.25 m/s squared
hope this helps x
Answer:
Part a)
Width of the slit is

Part b)
Ratio of intensity is given as

Explanation:
Part a)
As we know by the formula of diffraction we will have

so we have


so we will have


Part b)
As we know that the intensity in diffraction pattern is given as


so for angle 45 degree



Just one the earth is the only one like it it's completely unique
K.E = 0.5 * m * v^2
= 0.5 * 80 * (1.5)^2
K.E = 90 joule