a race car is travelling at +76m/s when it slows down at -9m/s2 for 4 seconds. whats his new velocity?

A :-) for this question we should apply
v = u + at
Given - u = 76 m/s
v = ?
a = - 9 m/s^2
t = 4 sec
Solution -
v = u + at
v = 76 + ( -9 ) x 4
v = 76 - 9 x 4
v = 76 - 36
v = 40 m/s

.:. The new velocity is 40 m/s