John is going to use a rope to pull his sister Laura across the ground in a sled through the snow. He is pulling horizontally with a constant force of 400 N. John and manages to get the sled going from 0 to 4 m/s in 5 s. The force due to friction on the sled is 310 N. What is the mass of Laura and the sled combined?

The mass of Laura and the sled combined is 887.5 kg

Explanation:

The total force due to weight of Laura and friction on the sled can be calculated as follows;

     = (400 + 310) N

     = 710 N

From Newton's second law of motion, "the rate of change of momentum is directly proportional to the applied force.

where;

is mass of Laura and

is mass of sled

Mass of Laura and the sled combined is calculated as follows;

given

V = Δv = 4-0 = 4m/s

t = 5 s

Therefore, the mass of Laura and the sled combined is 887.5 kg

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explanation: