We assume the origin is att the point of tacke off which means r0=0.
Also we have a=i+4j u=80i .
Using v=u+at gives at time t,
v=80i+(i+4j)t or
v=(80+t )i+4t j
Using r=ut+21at 2+r0 gives at time t,
r=80it+21(i+4j)t 2
r=(80t+21t 2 )i+2t 2 j
