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Physics

(i) Why is the motion of a body moving with a constant speed around a circular path said to be accelerated?

(ii) Name the unit of physical quantity obtained by the formula 2KV2\dfrac{2K}{V^2}.
Where K: kinetic energy, V: Linear Velocity.

Force

ICSE 2018

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Answer

(i) The motion of a body moving with a constant speed around a circular path is said to be accelerated because as the direction keeps changing the velocity changes and therefore it's an accelerated motion.

(ii) 2KV2\dfrac{2K}{V^2} = 2×(12×mV2)V2\dfrac{2 \times (\dfrac{1}{2} \times mV^2)}{V^2} = m.

Therefore, the quantity, 2KV2\dfrac{2K}{V^2} will have the unit of mass m which is kilogram (kg).

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