Problem 75P

A Volcano launches a lava bomb straight upward with an initial speed of 28 m/s. Taking upward to be the positive direction, find the speed and direction of motion of the lava bomb (a) 2.0 seconds and (b) 3.0 seconds after it is launched.

Solution 75P

a.)

Step 1 of 2

We have to find the speed and direction of motion of the lava bomb 2.0 seconds after it was launched straight upward with an initial speed of 28 m/s.

The speed and direction of motion of the lava bomb 2.0 seconds after it was launched straight upward can be found using equation of motion for freely falling object.

where,

initial speed = 28 m/s

9.81 m/s2

s

Hence, the speed of lava bomb is\

= 8.4 m/s (upwards)

Therefore, the speed and direction of motion of the lava bomb 2.0 seconds after it was launched are 8.4 m/s and upwards.

b.)