Question A lidless rectangular water tank made of zinc plates is 2m long, 1.5m broad and 1m high. How many square metres of zinc plates are used in the tank?

Answer: Step-by-step explanation: Time to reach Maximum height , t = 6/2 = 3 s. v = 0 (at the maximum height ) a = – 9.8 m s-² ◆ a) Using, v = u + at, we get 0 = u – 9.8 × 3 or, u = 29.4 ms-¹ Thus, the velocity with which it was thrown up = 29.4ms-¹ ◆ b) Using, 2aS = v² – u², we get S = v²- u²/2a = 0 – 29.4 × 29.4/- 2× 9.8 = 44.1 m Thus, Maximum height it reaches = 44.1 m. ◆ c) Here, t = 4s. In 3 s, the ball reaches the maximum height and in 1 s it falls from the top. Distance covered in 1 s from maximum height, S = ut + 1/2at ² = 0 + 1/2 × 9.8 × 1 = 4.9 m Therefore, The ball will be 4.9 m below the top of the tower after 4 s Reply

Answer:Step-by-step explanation: