A halfback on an apparent breakaway for a touchdown is tackled from behind. If the halfback has a mass of 98 kg and was moving at 4.2 m/s when he was tackled by an 85 kg cornerback running at 5.5 m/s in the same direction, what was their mutual speed immediately after the touchdown-saving tackle? m/s

The mutual speed immediately after the touchdown-saving tackle is 4.80 m/s

Explanation:

Given that,

Mass of halfback = 98 kg

Speed of halfback= 4.2 m/s

Mass of corner back = 85 kg

Speed of corner back = 5.5 m/s

We need to calculate their mutual speed immediately after the touchdown-saving tackle

Using conservation of momentum

Where, = mass of halfback

=mass of corner back

= velocity of halfback

= velocity of corner back

Put the value into the formula

Hence, The mutual speed immediately after the touchdown-saving tackle is 4.80 m/s

kinetic

i'm so sorry if this is wrong i'm only in 6th grade xd

it has to be b, about 97 percent.