The velocity of a object in the – plane is given by m s

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

The velocity of a

1.5\,\text{kg}

object in the

x

–

y

plane is given by

\mathbf{v}(t)=5 t\,\hat{i}+2 t^{2}\,\hat{j}

m s

^{-1}

, where

t

is in seconds. What is the net force on the object at

t = 2\,\text{s}

? (a)

(15\,\hat{i}+24\,\hat{j})\ \text{N}

(b)

(5\,\hat{i}+8\,\hat{j})\ \text{N}

(c)

(7.5\,\hat{i}+12\,\hat{j})\ \text{N}

(d)

(7.5\,\hat{i}+6\,\hat{j})\ \text{N}

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