Need asap just questions 22, 23, 24, & 25

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

What is a costume plot? why is it important to a film or theater production?