Question

(i) If weight of an object is 78 N on moon, calculate its mass on moon.

(ii) Harry went to a fair and observed that the 'dragon train' attains a

speed from 0 Km/h to 90 Km/h in 1 min and 30 seconds. If mass of the

train is 100 Kg, calculate the force exerted by the train on the track at

the end of 1 min and 30 seconds​

Answer 1

(i)weight on moon= mass*acceleration(on moon)

   78N=mass*9.8/6

 =>mass=(78*6)/9.8

=>mass=468/9.8

=>mass=46.6(approximately)

(ii)v(final velocity)=90 km/hr=25m/sec

u(initial velocity)=o km/hr=0 m/sec

time=1 min 30 sec=90sec

then a(acceleration)=(v-u)/t=(25-0)/90=25/90=5/18 m/s^2

mass=100kg

hence Force=mass*a=100*5/18=500/18=27.77 N

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