Question

20. M/J 14/P11/07
An object is thrown with velocity 5.2ms vertically upwards on the Moon. The acceleration due to gravity on the Moon is
1.62ms 2
What is the time taken for the object to return to its starting point?
A 2.5s
B 3.25
C 4.55
D 6.45

Answer 1

The time taken for the object to return to its starting point is 3.2 seconds.

Explanation:

It is given that,

Initial speed of the object, u = 0

Final velocity of the object, v = 5.2 m/s

The value of acceleration due to gravity on the moon, $a=1.62\ m/s^2$

Let t is the time taken for the object to return to its starting point. Using the first equation of motion.

$t=\dfrac{v-u}{a}$

$t=\dfrac{5.2-0}{1.62}$

t = 3.2 seconds

So, the correct option is (b).

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Topic : Equation of kinematics

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