Question 194: Laws of Motion

Question

Force is applied to a body of mass 3 kg at rest on a frictionless horizontal surface as shown in the force against time (F-t) graph. The speed of the body after 1 s is

Accepted Answer

Change in momentum is given by the area under the F - t graph.
$$ \begin{aligned} & 	ext { Area }=8 	imes 0.5+4 	imes 0.5 \ & =4+2=6 \mathrm{~N}-\mathrm{s} \ 	herefore & \mathrm{mv}=6 \mathrm{~N}-\mathrm{s} \ 	herefore & \mathrm{v}=\frac{6}{3}=2 \mathrm{~m} / \mathrm{s} \end{aligned} $$

Answer

$8 \mathrm{~m} / \mathrm{s}$

Answer

$6 \mathrm{~m} / \mathrm{s}$

Answer

$4 \mathrm{~m} / \mathrm{s}$

Answer

$2 \mathrm{~m} / \mathrm{s}$

Laws of Motion

Force is applied to a body of mass 3 kg at rest on a frictionless horizontal surface as shown in the force against time (F-t) graph. The speed of the body after 1 s is

Choose the correct answer: