Answer:
16 is Potential energy and 411.6 Joules, 17 is Kinetic energy 896,000
Step-by-step explanation:
PE=mgh
2 kg(9.8m/sec^2) 21m= 411.6J
KE=1/2mv^2= 1/2(1120kg)(40m/s)^2= 896,000J
With the current 40 miles per hour
Against the current 30 miles per hour
bv means boat velocity with NO current
cv means current velocity
A) bv + cv = 40 mph
B) bv - cv = 30 mph
Adding both equations:
2bv = 70
boat velocity with NO CURRENT = 35 miles per hour
Using equationA
bv + cv = 40
35 + cv = 40
current velocity = 5 miles per hour
The answer to the question