1.

A body start with velocity 20m/s after 2 seconds it comes to rest. find the acceleration aquired by the body.​

Answer»

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★ Gɪᴠᴇɴ :-

  • Initial velocity = 20 m/s
  • Comes rest after 2 seconds

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★ Tᴏ Fɪɴᴅ :-

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★ Sᴏʟᴜᴛɪᴏɴ :-

Finding acceleration acquired using first equation of motion.

v = u + at

Where,

  • v → final Velocity = 0 m/s
  • a → acceleration = ?
  • u → initial velocity = 20 m/s
  • t → time TAKEN = 2 s

Note :- Here , the final velocity ( v ) will be zero because the boday comes rest after two second . So , final velocity ( v ) = 0 m/s.

Substituting the values we have,

⇒ 0 = 20 + a(2)

⇒ - 20 = 2a

⇒ a = -20 ÷ 2

⇒ a = - 10 m/s²

Note :- Negative SYMBOL show that the BODY has retardation.

Hence , acceleration of the body is - 10 m/s²

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