The scalar x-component of a displacement vector for a trip is -70 km. Represent the trip using the x-coordinate axis. Choose Earth to be the object of reference. Use the x-axis with a positive direction pointing to the east and negative direction pointing to the west. The displacement is positive when moving in the east direction.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.

helium

oxygen

neon

sodium