Question

I've been quite confused with these two questions, I'd be extremely grateful if anyone could answer and explain them to me! Thanks

Answer 1

F = GMm / r^2 for m :-

cross multiply:-

GMm = Fr^2

now divide both sides by GM:-

m =Fr^2 / GM



For r :-

Fr^2 = GMm

r^2 = GMm / F

r = sqrt (GMm/F) Answer



6. Vt^2 = Vo^2 + 2ad

subtract 2ad from both sides:-

Vt^2 - 2ad = Vo^2

Vo = sqrt (Vt^2 - 2ad) answer