Find force on a crate while a driver accelerates

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To find the force acting on a crate during a truck's acceleration, the mass of the crate is 250 kg, and the truck accelerates from 40.0 km/h to 70.0 km/h in 8 seconds. The acceleration is calculated to be approximately 3.8 m/s² after converting the speeds to m/s. Using the formula f=ma, the force is determined to be around 950 N, which is not listed as an option. The initial calculation was incorrect due to a misunderstanding of the acceleration and force relationship, highlighting the importance of unit conversion and proper application of physics equations. The correct approach leads to a force of 950 N acting on the crate.
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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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