Question

A ball of mass m collides with a wall with speed v and rebounds on the same line with the same speed.if mass of wall is taken as infinite then work done by ball on wall is

Answer 1

Work Done = F cos theta × s

s (displacement) = 0

Work Done = F cos theta × 0
"""""""""”"""" = 0 Joules.

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Answer 2

$\textbf{Hey!!}$

• Work Done = Force • Displacement

• As, the ball rebounds back with the same speed and in the same line, the displacement is zero.

• And, the ball is moving is horizontal direction, so the value of force would be a component of the force applied i.e. F cos Θ.

• Now, W = F cos Θ • s

• W = 0 Watt

Hope it helps!!

@charlie16.