A particle initially located at the origin has an acceleration of vector a = 5.00j m/s2 and an initial velocity of vector v i = 8.00i m/s.
a)Find the vector position at any time t (where t is measured in seconds). (Use the following as necessary: t.)
Find the vector velocity at any time t.
b)Find the coordinates of the particle at t = 2.00 s.
Find the speed of the particle at this time.
Not quite sure. Tried rf=ri+Vit+1/2at^2
The Attempt at a Solution
For a) I plugged what i thought was right into the first equation above with ri=0i+0j because it is at the origin(see question) but the answer (8.00it+2.50jt^2) was wrong