##### Question

# Calculate Fractional standard deviation.

The speed v of a 1.65 kg cart is measured after it rolls 1.00 m down an inclined track. Five readings are taken and the average and standard deviation of the speed iscomputed. The results are v = 0.40 m/s and sv = 0.12 m/s.

Calculate the fractional standard deviation in the speed.

ev = 0.3

Calculate the kinetic energy of the cart at the end of the trip.

K = 0.13

Calculate the fractional standard deviation in the kinetic energy.

eK = _________

Calculate the standard deviation in the kinetic energy.

sK = _________

Record the value of the kinetic energy using the form K±sK (units) with correct significant figures .

K = _____________

Part a and b are simple, but I couldn't get what is wrong with the equation I used on c and d. The web is not accepting my answer.