Find force on a crate while a driver accelerates

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SUMMARY

The discussion centers on calculating the force acting on a crate with a mass of 250 kg during the acceleration of a truck from 40.0 km/h to 70.0 km/h over 8 seconds. The correct approach involves first converting the speeds to meters per second, resulting in an acceleration of 3.86 m/s². Using Newton's second law (f=ma), the force acting on the crate is calculated as 965 N, which is not listed among the provided options. The confusion arises from the incorrect application of the formula and unit conversion.

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Homework Statement


A crate with a mass of 250 kg rests on the bed of a truck that is moving at a speed of 40.0 km/h. The driver accelerates to a speed of 70.0 km/h in 8 s. Assuming the force is constant, what force acts on the crate during this time? Assume that the crate does not slide on the bed of the truck.
A) 18 N
B) 3400 N
C) 240 N
D) 260 N


Homework Equations



f=ma

The Attempt at a Solution


Well I would think that you would find acceleration giving you 3.8m/s2 and then take 250/3.8 but that gets you 65.789 which is not an option.
 
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Make sure you're converting the km/h to m/s.
 
That helped. Thanks!
 

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