Question

If a 100 kg person on earth stands on a scale, what will his weight be on earth? (use 9.8 m/s2 as thor a for eannHow would this value differ on the moon, where the value of a is 1/6 what it is on earth?A woman is pushing a car with a mass of 200 Kg to a gas station. Ignoring friction, what is the net force she exerts to get the car to accelerate to 0.1m/s2 north?

Answer 1

K.e = 1/2 mv²

so , m = 120kg and V = 20m/s;

K.e = 60* 400= 24000J

2. energy supplied = mgh

= 100*9.8 *4 = 3920J

power = work done /time

= mgh/time = 600*9.8*3/3 = 600 * 9.8 = 5880J/s