A boat is able to move through still water at 20m/s. It makes a round trip to. a town 3km upstream. If the river flows at 5m/s, the times required for the round trip. is

the answer is 320 seconds :)

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27