Question

A constant force 5 N is applied continuously on a body of mass 10 kg for 4 sec. The body moves 800 cm along a straight line. What the velocity of the body when the force was applied initially

Answer 1

Answer:

ans: 176.5 m/s

Explanation:

F =ma

a =0.5 and

now using Newton's second equation of motion

s=ut + 1/2 at^2

800= u×4 +1/2×1/2×16

u=706/4 ans

Answer 2

• F = ma
• a = F/m

• a = 5 N / 10 kg = 0.2 m/s²
• S = ut + at²/2
• 8 m = 4u + 4*4²/2
• 8 = 4u + 32
• 4u = 24
• u = 6

★ Thus, intial velocity of object is 6 m/s