Physics problems (circular motion) help please?

I've been stuck on the following problems for a really long time now, and I haven't been able to figure it out. I'd appreciate it if anyone could help me. Thanks. 1. In which of the following situations would an object be accelerated? i. it moves in a straight line at constant speed ... show more I've been stuck on the following problems for a really long time now, and I haven't been able to figure it out. I'd appreciate it if anyone could help me. Thanks.

1. In which of the following situations would an object be accelerated?
i. it moves in a straight line at constant speed
ii. it ovies with uniform circular motion
iii. It travels as a projectile in a gravitational field w/ negligible air resistance.
a. i
b. iii
c. i, ii
d. ii, iii
e. i, ii, iii

2. A point on a wheel rotating at 5 rev/second and located 0.2 m from the axis has what tangential velocity?
4 answers 4