Question

A formula for calculating kinetic energy,k,of an object is shown below.An object has a mass of 35 kilograms,to the nearest 5 kilograms ,and is moving at a speed of 4.9 metres per second,to 2 significant figures.Use the formula below to calculate the lower and upper bounds of the kinetic energy of this object.Give your answers in joules (J) to 1 decimal place.

Answer 1

Explanation:

Mass could be 32.5 to < 37.5 kg to round to 35 kg nearest 5 kg

Speed could be 4.85 to < 4.95 m/s to round to 4.9 m/s to 2 sig figs

KE = 1/2 mv^2

Lowest KE : 1/2 32.5 ( 4.85^2) = 382.2 j

Highest KE 1/2 (37.5)(4.95^2) < 459.4 j