Suppose it takes a constant force a time of 6.0 seconds to slow a 2500 kg truck from 26.0 m/sec to 18.0 m/sec. What is the magnitude of the force? Give
your answer in scientific notation rounded correctly.

Explanation:

Impulse on an object is given by .

However, it's also given as change in momentum (impulse-momentum theorem).

Therefore, we can set the change in momentum equal to the former formula for impulse:

.

Momentum is given by . Because the truck's mass is maintained, only it's velocity is changing. Since the truck is being slowed from 26.0 m/s to 18.0 m/s, it's change in velocity is 8.0 m/s. Therefore, it's change in momentum is:

.

Now we plug in our values and solve:

(two significant figures).

are their multiple choices ?

explanation: