Answer:
692.4m/s
Explanation:
According to Newton's second law;
F = ma
F = m(v-u)/t
m is the mass
v is the final velocity
u is the initial velocity
t is the time
F is the forcr
Given
F = 450N
m = 2800kg
u =690m/s
t =15s
v = ?
Substitute into the formula
450 = 2800(v-690)/15
450×15 = 2800(v-690)
6750 = 2800(v-690)
6750/2800 =v-690
2.4 = v-690
v = 690+2.4
v = 692.4m/s
Hence the final velocity is 692.4m/s
