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Explanation:
15. 2. - 1400 N
Initial velocity u = 60 km/hr = 16.66 m/s
Final velocity v = 0
Accerelation a = ?
Displacement S = 50 m
By third equation pf motion
v² = u² + 2 aS
(0)² = (16.66)² + 2 × a× 50
0 = 277.55 × 100 a
a = - 277.55 / 100
a = - 2.7755 m/s²
Force = mass × accerelation
F = 504 × - (2.7755)
F = - 1398.852 N = - 1400 N
16. 3. same accerelation
Because both fall under the action of gravitational force
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