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
$\Rightarrow10=\frac{1}{2}\text{a}(2^2)$
$\Rightarrow10=2\text{a}$
$\Rightarrow\text{a}=5\text{m/s}^2$
Force: F = ma = 2 × 5 = 10N
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