Question

A tennis ball is dropped from a roof 16 meters from the

ground. How long does it take for the ball to reach the

ground?( g=10m/s2)​

Answer 1

Answer:

1.6s

Explanation:

distance= 16meters

speed= 10m/s²

time= distance/ speed

time = 16 meters× s/10m

time= 1.6s

Answer 2

The time taken by the ball to reach the ground is equal to 1.76sec

Explanation:

Given,

• the height of the roof is 16m from the ground. The acceleration due to gravity is 10 metre per second square.

• By the equation of kinematics , S = ut+ 1/2 at², where t is the time taken to reach the ground

• the initial velocity is equal to 0 because it is dropped with no velocity,

• Or , t = ✓ 2S/a = ✓ ( 2x16/ 10) = 0.8✓5 sec= 1.76sec

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