Question

A 1 kg mass has a kinetic energy of 1 joule when its
speed is
(a) 0.45 ms -1
(b) 1 ms-
(d) 1.4 ms-1
(d) 4,4 ms-1
​

Answer 1

ANSWER-

B. 1ms-

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Answer 2

Answer:

c. 1.4 ms-¹

Explanation:

Mass m = 1 kg

Kinetic energy K.E. = 1 joule

Velocity v = ?

$K.E = \frac{1}{2} \times m \: \times {v}^{2}$

$1 = \frac{1}{2} \times 1 \times {v}^{2}$

${v}^{2} = 2$

$v \: = \sqrt{2}$

$v \: = 1.4 \: m {s}^{ - 1}$