The momentum of a falling rock is found to be 200 kg m/s. What is the mass of the rock if it falls with a velocity of 5.0 m/s

mass= 40 kg

Explanation:

p=mv

200 kg*m/s=(5.0 m/s)*m

200/5=40 kg

which statement about this sum is true? −245+2.7

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