An inelastic ball is dropped from a height of 100 m. Due to some reasons it loses 20 % of its energy. The height of rebound of ball is

Question

An inelastic ball is dropped from a height of 100 m. Due to some reasons it loses 20 % of its energy. The height of rebound of ball is (A) 80 m (B) 40 m (C) 60 m (D) 20 m

Tardigrade Admin · Accepted Answer

mgh' = (mgh) (80/100) i.e. h' = 100 × (80/100) = 80 m

Q. An inelastic ball is dropped from a height of $100 m$ . Due to some reasons it loses $20%$ of its energy. The height of rebound of ball is

80 m

40 m

60 m

20 m

$m g h^{'} = (m g h) \frac{80}{100}$ i.e. $h^{'} = 100 \times \frac{80}{100}$ = 80 m

Q. An inelastic ball is dropped from a height of 100m. Due to some reasons it loses 20% of its energy. The height of rebound of ball is