'G' is the 'universal gravitational constant'. We could look it up. 'M₁' is the mass of one object 'M₂' is the mass of the other object 'R' is the distance between their centers.
It looks complicated, but stay with me. We can do this ! We know all the numbers, so we can calculate the force.
'G' is 6.67 x 10⁻¹¹ newton·meter² / kg² (I looked it up. You're welcome.) 'M₁' is 15 kg 'M₂' is 15 kg 'R' is 0.25 meter.
Now it's time to pluggum in.
F = G · M₁·M₂ / R²
= (6.67 x 10⁻¹¹ newton·meter² / kg²) · (15 kg) · (15 kg) / (0.25 m²)
That a force equivalent to about 0.00000086 of an ounce. This is the answer to part-a.
Concerning the answer to part-b ... Personally, I could not detect this force, no matter what kind of equipment I had. But I am just a poor schlepper engineer, educated in the last Century, living out my days on Brainly and getting my kicks from YouTube videos. I am not pushing the box to the envelope, or thinking outside the cutting edge ... whatever. I am sure there are people ... I can't name them, because they keep a low profile, they stay under the radar, they don't attract a lot of media attention, their work is not as newsworthy as the Kardashians, and plus, they seldom call me or write to me ... but I know in my bones that there are people who have measured the speed of light to NINE significant figures, aimed a spacecraft accurately enough to take close-up pix of Pluto ten years later, and detected gravity waves from massive blobs that merged 13 billion years ago, and I tell you that YES ! THESE guys could detect and measure a force of 0.86 micro-ounce if they felt like it !
Consider horizontal component:
Using the formula:v2=u2+2a<span>s</span> <span>0=(16sin<span>470</span><span>)2</span>+2(−9.81)s</span><span>s=6.98m</span><span>=7.0m(2s.f.)</span>The maximu height from the ground is 8.5m
