(d) You observe someone pulling a block of mass 40 kg across a low-friction surface. While they pull a distance of 4 m in the direction of motion, the speed of the block changes from 5 m/s to 6 m/s. Calculate the magnitude of the force exerted by the person on the block. F

55 N

Explanation:

We find the acceleration of the block. The velocity changed from 5 m/s to 6 m/s in a distance of 4 m. We use the equation of motion:

and v are the initial and final velocities, a is the acceleration and s is the distance.

The force exerted on the block, assuming no friction, is

the entire statement is true and correct.  

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