A particle of mass m moves along a straight path with a speed v defined by the function

PHYSICS · Single correct · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

4. A particle of mass m moves along a straight path with a speed v defined by the function

\mathrm{v}=\mathrm{bt}^{2}+\mathrm{c}

, where b and

c

are constants and

t

is time. What is the magnitude

F

of the net force on the particle at time

t=t_{1}

? (A)

\mathrm{bt}_{1}{ }^{2}+\mathrm{c}

(B)

3 m b t_{1}+2 c

(C)

\mathrm{mbt}_{1}

(D)

m b t_{1}+c

(E)

2 m b t_{1}