6. A 150 kg motorcycle falls off a bridge and drops straight down into the water. The motorcycle is moving at 12.5 m/s when it hits the water. If the motorcycle comes to rest 7.00 m beneath the surface, determine the average force exerted by the water.

A 1050 N
B 1670 N
C 1880 N
D 3350 N

Question

6.	A 150 kg motorcycle falls off a bridge and drops straight down into the water. The motorcycle is moving at 12.5 m/s when it hits the water.  If the motorcycle comes to rest 7.00 m beneath the surface, determine the average force exerted by the water. 

A	1050 N
B	1670 N
C	1880 N
D	3350 N

anonymous · Answer

B?

anonymous · Answer

find accelerations using kinematics... then use F=ma

anonymous · Answer

howw?

anonymous · Answer

v2= u2 + 2as to find a
then use f=ma

anonymous · Answer

what is u?

anonymous · Answer

u= initial velocity
v= final velocity

anonymous · Answer

okay thanks! i have a few more ?s but ill be back in 30mins its ok if u go to sleep! thanks for all ur help! one last question though whats the formula for thermal energY?

anonymous · Answer

i will be around here. revising... its just 10pm here.. for the energy question, 
relative to that question,
Potential energy( delta E) = kinetic energy (work done) + thermal energy (Q)

anonymous · Answer

thanks!