Answer:
The answer is 15,000 N
Step-by-step explanation:
To find the force given the mass , velocity and time can be found by using the formula

where
m is the mass
v is the velocity
t is the time
From the question
m = 1500 kg
v = 30 m/s
t = 3 s
We have

We have the final answer as
15,000 N
Hope this helps you