A 5 kg object is propelled from rest at time by a net force that always acts in the…

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

26. A 5 kg object is propelled from rest at time

t=0

by a net force

\mathbf{F}

that always acts in the same direction. The magnitude of

\mathbf{F}

in newtons is given as a function of

t

in seconds by

F=0.5 t

. What is the speed of the object at

t=4 \mathrm{~s}

? (A)

0.5 \mathrm{~m} / \mathrm{s}

(B)

0.8 \mathrm{~m} / \mathrm{s}

(C)

2.0 \mathrm{~m} / \mathrm{s}

(D)

4.0 \mathrm{~m} / \mathrm{s}

(E)

8.0 \mathrm{~m} / \mathrm{s}