Physics, asked by bidiyasarmanish6236, 9 months ago

A truck starts from rest and rolls down a hill with a constant acceleration. it travells s distance of 400 m in 20s . find its acceleration. find the force acting on it if its mass is 7 tonnes ( hint: 1tonne= 1000kg)

Answers

Answered by MяƖиνιѕιвʟє
43

Given :-

  • Initial velocity (u) = 0
  • Distance (s) = 400m
  • Time (t) = 20s
  • Mass (m) = 7 tonnes

To find :-

  • Acceleration
  • Force

Solution :-

According to the second equation of motion

→ s = ut + ½ at²

→ 400 = 0 × 20 + ½ × a × (20)²

→ 400 = ½ × a × 400

→ 400 = 200a

→ a = 400/200 = 2m/s²

Hence,

  • Acceleration of truck = 2m/s²

As we know that

  • 1 tonne = 1000kg
  • 7 tonne = 7*1000 = 7000kg

→ Force = mass × acceleration

→ F = ma

→ F = 7000 × 2

→ F = 14000N

Hence,

  • Force acting is 14000N

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