Question

a pebble is thrown vertically upwards with an initial velocity of 50m/s comes to a stop in 5 secs find the retardation

Answer 1

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Answer 2

Answer:

Given, u = 50 m/s

v = 0

t = 5 s

$acceleration \: = \frac{v - u}{t}$

$\: \frac{0 - 50 \: ms {}^{ - 1} }{5s}$

$\: = - 10 \: ms { }^{ - 2}$

Hence , retardation = 10 m/s²

Explanation:

If the velocity of body increases with time, the motion is said to be accelerated, while if the velocity of body decreases with time, The motion is said to be decelerated or retarded. Thus, retardation is the negative acceleration.