The answer should be B.
Hope it helped you.
F = ma
F 1500N
m = 100 kg
1500 = 100 * a
Solve for a.
Answer:
Momentum of mass 
is 83·7 kg m/s towards north
Momentum of mass 
is 38·72 kg m/s towards east
Explanation:
Given
Mass of = 6·2 kg
Mass of = 4·4 kg
Velocity of mass = 
= 13·5 m/s
Velocity of mass = 
= 8·8 m/s
Momentum of mass = × = 6·2 × 13·5 = 83·7 kg m/s
Momentum of mass = × = 4·4 × 8·8 = 38·72 kg m/s
As mass is moving North, the direction of momentum will also be in that direction because the direction of momentum will be in the direction of velocity
As mass is moving East, the direction of momentum will also be in that direction because the direction of momentum will be in the direction of velocity
∴ Momentum of mass is 83·7 kg m/s towards north
∴ Momentum of mass is 38·72 kg m/s towards east
Answer: concentration c = 25.2 g /(41.99 g/mol × 0.75 l)
Explanation: M(NaF) = 41.99 g/mol and amount of substance n = m/M.
Concentration c = n/V
Answer: 9300 kcal
Explanation: Given: Latent heat of fusion of aluminum is 93 kcal/kg.
That is for melting 1 kg of aluminium at 660
amount of heat required is = 93kcal
Thus for 100 kg of aluminium at 660 amount of heat required is= 
Thus the amount of energy needed to melt 100 kg of aluminum at the melting point is 9300 kcal.
