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2 years ago

A ball thrown vertically upwards from ground

Physics

1 answer:

weqwewe [10]2 years ago

4 0

parabolic motion

$\tt t_{max}=\dfrac{2u~sin~\alpha }{g}$

$\tt h_{max}=\dfrac{u^2sin^2\alpha }{2g}$

vertically upwards ⇒ α = 90°⇒sin 90° = 1

$\tt 4=\dfrac{2u}{10}\rightarrow u=20~m/s$

$\tt h_{max}=\dfrac{20^2}{2.10}=\boxed{\bold{20~m}}$

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3 years ago

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3 years ago

Read 2 more answers

You are traveling in a car that is moving at a velocity of 30 m/s. Suddenly, a car 15 meters in front of you slams on its brakes

Artemon [7]

Answer:

The acceleration of car is 6.67 m/s².

Explanation:

Given that,

Initial velocity = 30 m/s

Distance = 15 m

Final velocity = 10 m/s

Time = 3 sec

We need to calculate the acceleration

Using formula of acceleration

$a=\dfrac{v_{f}-v_{i}}{t}$

$a=\dfrac{10-30}{3}$

$a=\dfrac{-20}{3}$

$a=-6.67\ m/s^2$

Negative sign shows the car is slowing down.

Hence, The acceleration of car is 6.67 m/s².

7 0

4 years ago