mass of an aeroplane is 480 quintal it starts from rest and develops a speed of 42ms^-1 just before take off if the length of the runaway is 2 km calculate the power?

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

In a system, when potential energy decreases, then entropy also decreases. true false