Physics Question Help

[amin18]

If s = 10t2 + 10, find s, v, a at t = 2s. (5 marks)

If u1 = u2 = u for two projectiles, and these two projectiles are thrown at angles θ1 and θ2 and cover the same horizontal distance xt, so land at the same point. Find a relation between θ1 and θ2. (10 marks)

If the radius of earth is re, and its mass is me. If the earth collides with another object, and after collision, the new radius of earth is r = 4re and the new mass is m = 4me. What will happen to the terminal velocity of an object, if all the other conditions do not change. (10 marks)

If F1 = (2,4,7), and F2 = (2,1,4), then find F1 + F2, F1 − F2, F1.F2, |F1|, |F2|. (5 marks)

[vetuste_ennemi]

I think the terminal velocity will decline, considering the importance of function(f) to the F equation in the OP.

[vetuste_ennemi]

In some biological analogies the technical term is "wilt".

[Arksided]

I think the only possible change in Q2 would be gravity.

[vetuste_ennemi]

Arksided on the next British bank note.

[TonyV]

Why do need help with such a simple question?

[vetuste_ennemi]

...because Amin is bored and doesn't have a partner.

[Arksided]

Thank you. shy Albert... we all know about velocity and projectiles.

[Old_Geezer]

You can't know velocity without knowing the direction.
I've a suspicion that 45º might relate to part of the answer.
Bored too now.