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Newton’s Laws of Motion — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsNewton’s Laws of Motion2 Marks
Question
A block of mass 2kg placed on a long frictionless horizontal table is pulled horizontally by a constant force F. It is found to move 10m in the first two seconds. Find the magnitude of F.
✓

Answer

m = 2kg

S = 10m

Let, acceleration = a, Initial velocity u = 0.

$\text{S = ut}+\frac{1}{2}\text{at}^2$

$\Rightarrow10=\frac{1}{2}\text{a}(2^2)$

$\Rightarrow10=2\text{a}$

$\Rightarrow\text{a}=5\text{m/s}^2$

Force: F = ma = 2 × 5 = 10N

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