John traveled east at 10 m/s for ten
seconds. he realized he had gone too
far and made a u-turn. he traveled
west at 5 m/s for six seconds. calculate
john's displacement.
a. 30 m
b. 70 m
c. 100 m
d. 130 m

Estimate the kinetic energy of the neptune with respect to the sun as the sum of the terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. [assume the neptune is a uniform sphere with mass = 1.0×1026 kg , radius = 2.5×1010 m , rotation period 16.1 h , orbital period 6.01×104 d and is 4.6×109 km from the sun.]